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V

The Court of Appeals applied what it believed to be the undue burden standard, and upheld each of the provisions except for the husband notification requirement. We agree generally with this conclusion, but refine the undue burden analysis in accordance with the principles articulated above. We now consider the separate statutory sections at issue.

A

Because it is central to the operation of various other requirements, we begin with the statute's definition of medical emergency. Under the statute, a medical emergency is

"[t]hat condition which, on the basis of the physician's good faith clinical judgment, so complicates the medical condition of a pregnant woman as to necessitate the immediate abortion of her pregnancy to avert her death or for which a delay will create serious risk of substantial and irreversible impairment of a major bodily function." 18 Pa.Cons.Stat. § 3203 (1990).

[505 U.S. 833, 880]

Petitioners argue that the definition is too narrow, contending that it forecloses the possibility of an immediate abortion despite some significant health risks. If the contention were correct, we would be required to invalidate the restrictive operation of the provision, for the essential holding of Roe forbids a State from interfering with a woman's choice to undergo an abortion procedure if continuing her pregnancy would constitute a threat to her health. 410 U.S., at 164. See also Harris v. McRae, 448 U.S., at 316.

The District Court found that there were three serious conditions which would not be covered by the statute: preeclampsia, inevitable abortion, and premature ruptured membrane. 744 F.Supp., at 1378. Yet, as the Court of Appeals observed, 947 F.2d, at 700-701, it is undisputed that, under some circumstances, each of these conditions could lead to an illness with substantial and irreversible consequences. While the definition could be interpreted in an unconstitutional manner, the Court of Appeals construed the phrase "serious risk" to include those circumstances. Id., at 701. It stated: "[W]e read the medical emergency exception as intended by the Pennsylvania legislature to assure that compliance with its abortion regulations would not in any way pose a significant threat to the life or health of a woman." Ibid. As we said in Brockett v. Spokane Arcades, Inc., 472 U.S. 491, 499-500 (1985): "Normally, . . . we defer to the construction of a state statute given it by the lower federal courts." Indeed, we have said that we will defer to lower court interpretations of state law unless they amount to "plain" error. Palmer v. Hoffman, 318 U.S. 109, 118 (1943). This "reflect[s] our belief that district courts and courts of appeals are better schooled in, and more able to interpret, the laws of their respective States." Frisby v. Schultz, 487 U.S. 474, 482 (1988) (citation omitted). We adhere to that course today, and conclude that, as construed by the Court of Appeals, the medical emergency definition imposes no undue burden on a woman's abortion right.

B

We next consider the informed consent requirement. 18 Pa. Cons.Stat. § 3205 (1990). Except in a medical emergency, the statute requires that at least 24 hours before performing an abortion a physician inform the woman of the nature of the procedure, the health risks of the abortion and of childbirth, and the "probable gestational age of the unborn child." The physician or a qualified nonphysician must inform the woman of the availability of printed materials published by the State describing the fetus and providing information about medical assistance for childbirth, information about child support from the father, and a list of agencies which provide adoption and other services as alternatives to abortion. An abortion may not be performed unless the woman certifies in writing that she has been informed of the availability of these printed materials and has been provided them if she chooses to view them.

Our prior decisions establish that, as with any medical procedure, the State may require a woman to give her written informed consent to an abortion. See Planned Parenthood of Central Mo. v. Danforth, 428 U.S., at 67. In this respect, the statute is unexceptional. Petitioners challenge the statute's definition of informed consent because it includes the provision of specific information by the doctor and the mandatory 24-hour waiting period. The conclusions reached by a majority of the Justices in the separate opinions filed today and the undue burden standard adopted in this opinion require us to overrule in part some of the Court's past decisions, decisions driven by the trimester framework's prohibition of all pre-viability regulations designed to further the State's interest in fetal life.

In Akron I, 462 U.S. 416, we invalidated an ordinance which required that a woman seeking an abortion be provided by her physician with specific information "designed to influence the woman's informed choice between abortion or childbirth." Id., at 444. As we later described [505 U.S. 833, 882] the Akron I holding in Thornburgh v. American College of Obstetricians and Gynecologists, 476 U.S., at 762, there were two purported flaws in the Akron ordinance: the information was designed to dissuade the woman from having an abortion, and the ordinance imposed "a rigid requirement that a specific body of information be given in all cases, irrespective of the particular needs of the patient. . . ." Ibid.

To the extent Akron I and Thornburgh find a constitutional violation when the government requires, as it does here, the giving of truthful, nonmisleading information about the nature of the procedure, the attendant health risks and those of childbirth, and the "probable gestational age" of the fetus, those cases go too far, are inconsistent with Roe's acknowledgment of an important interest in potential life, and are overruled. This is clear even on the very terms of Akron I and Thornburgh. Those decisions, along with Danforth, recognize a substantial government interest justifying a requirement that a woman be apprised of the health risks of abortion and childbirth. E.g., Danforth, supra, at 66-67. It cannot be questioned that psychological wellbeing is a facet of health. Nor can it be doubted that most women considering an abortion would deem the impact on the fetus relevant, if not dispositive, to the decision. In attempting to ensure that a woman apprehend the full consequences of her decision, the State furthers the legitimate purpose of reducing the risk that a woman may elect an abortion, only to discover later, with devastating psychological consequences, that her decision was not fully informed. If the information the State requires to be made available to the woman is truthful and not misleading, the requirement may be permissible.

We also see no reason why the State may not require doctors to inform a woman seeking an abortion of the availability of materials relating to the consequences to the fetus, even when those consequences have no direct relation to her health. An example illustrates the point. We would think [505 U.S. 833, 883] it constitutional for the State to require that, in order for there to be informed consent to a kidney transplant operation, the recipient must be supplied with information about risks to the donor as well as risks to himself or herself. A requirement that the physician make available information similar to that mandated by the statute here was described in Thornburgh as an outright attempt to wedge the Commonwealth's message discouraging abortion into the privacy of the informed consent dialogue between the woman and her physician. 476 U.S., at 762. We conclude, however, that informed choice need not be defined in such narrow terms that all considerations of the effect on the fetus are made irrelevant. As we have made clear, we depart from the holdings of Akron I and Thornburgh to the extent that we permit a State to further its legitimate goal of protecting the life of the unborn by enacting legislation aimed at ensuring a decision that is mature and informed, even when, in so doing, the State expresses a preference for childbirth over abortion. In short, requiring that the woman be informed of the availability of information relating to fetal development and the assistance available should she decide to carry the pregnancy to full term is a reasonable measure to ensure an informed choice, one which might cause the woman to choose childbirth over abortion. This requirement cannot be considered a substantial obstacle to obtaining an abortion, and, it follows, there is no undue burden.

Our prior cases also suggest that the "straitjacket," Thornburgh, supra, at 762 (quoting Danforth, supra, at 67, n. 8), of particular information which must be given in each case interferes with a constitutional right of privacy between a pregnant woman and her physician. As a preliminary matter, it is worth noting that the statute now before us does not require a physician to comply with the informed consent provisions if he or she can demonstrate by a preponderance of the evidence that he or she reasonably believed that furnishing the information would have resulted in a severely [505 U.S. 833, 884] adverse effect on the physical or mental health of the patient. 18 Pa. Cons.Stat. § 3205 (1990). In this respect, the statute does not prevent the physician from exercising his or her medical judgment.

Whatever constitutional status the doctor-patient relation may have as a general matter, in the present context, it is derivative of the woman's position. The doctor-patient relation does not underlie or override the two more general rights under which the abortion right is justified: the right to make family decisions and the right to physical autonomy. On its own, the doctor-patient relation here is entitled to the same solicitude it receives in other contexts. Thus, a requirement that a doctor give a woman certain information as part of obtaining her consent to an abortion is, for constitutional purposes, no different from a requirement that a doctor give certain specific information about any medical procedure.

All that is left of petitioners' argument is an asserted First Amendment right of a physician not to provide information about the risks of abortion, and childbirth, in a manner mandated by the State. To be sure, the physician's First Amendment rights not to speak are implicated, see Wooley v. Maynard, 430 U.S. 705 (1977), but only as part of the practice of medicine, subject to reasonable licensing and regulation by the State cf. Whalen v. Roe, 429 U.S. 589, 603 (1977). We see no constitutional infirmity in the requirement that the physician provide the information mandated by the State here.

The Pennsylvania statute also requires us to reconsider the holding in Akron I that the State may not require that a physician, as opposed to a qualified assistant, provide information relevant to a woman's informed consent. 462 U.S., at 448. Since there is no evidence on this record that requiring a doctor to give the information as provided by the statute would amount, in practical terms, to a substantial obstacle to a woman seeking an abortion, we conclude that it is not [505 U.S. 833, 885] an undue burden. Our cases reflect the fact that the Constitution gives the States broad latitude to decide that particular functions may be performed only by licensed professionals, even if an objective assessment might suggest that those same tasks could be performed by others. See Williamson v. Lee Optical of Okla., Inc., 348 U.S. 483 (1955). Thus, we uphold the provision as a reasonable means to ensure that the woman's consent is informed.

Our analysis of Pennsylvania's 24-hour waiting period between the provision of the information deemed necessary to informed consent and the performance of an abortion under the undue burden standard requires us to reconsider the premise behind the decision in Akron I invalidating a parallel requirement. In Akron I we said: Nor are we convinced that the State's legitimate concern that the woman's decision be informed is reasonably served by requiring a 24-hour delay as a matter of course. 462 U.S., at 450. We consider that conclusion to be wrong. The idea that important decisions will be more informed and deliberate if they follow some period of reflection does not strike us as unreasonable, particularly where the statute directs that important information become part of the background of the decision. The statute, as construed by the Court of Appeals, permits avoidance of the waiting period in the event of a medical emergency, and the record evidence shows that, in the vast majority of cases, a 24-hour delay does not create any appreciable health risk. In theory, at least, the waiting period is a reasonable measure to implement the State's interest in protecting the life of the unborn, a measure that does not amount to an undue burden.

Whether the mandatory 24-hour waiting period is nonetheless invalid because, in practice, it is a substantial obstacle to a woman's choice to terminate her pregnancy is a closer question. The findings of fact by the District Court indicate that, because of the distances many women must travel to reach an abortion provider, the practical effect will often be [505 U.S. 833, 886] a delay of much more than a day because the waiting period requires that a woman seeking an abortion make at least two visits to the doctor. The District Court also found that, in many instances, this will increase the exposure of women seeking abortions to "the harassment and hostility of anti-abortion protestors demonstrating outside a clinic." 744 F.Supp., at 1351. As a result, the District Court found that, for those women who have the fewest financial resources, those who must travel long distances, and those who have difficulty explaining their whereabouts to husbands, employers, or others, the 24-hour waiting period will be "particularly burdensome." Id., at 1352.

These findings are troubling in some respects, but they do not demonstrate that the waiting period constitutes an undue burden. We do not doubt that, as the District Court held, the waiting period has the effect of "increasing the cost and risk of delay of abortions," id., at 1378, but the District Court did not conclude that the increased costs and potential delays amount to substantial obstacles. Rather, applying the trimester framework's strict prohibition of all regulation designed to promote the State's interest in potential life before viability, see id., at 1374, the District Court concluded that the waiting period does not further the state "interest in maternal health" and "infringes the physician's discretion to exercise sound medical judgment," id., at 1378. Yet, as we have stated, under the undue burden standard, a State is permitted to enact persuasive measures which favor childbirth over abortion, even if those measures do not further a health interest. And while the waiting period does limit a physician's discretion, that is not, standing alone, a reason to invalidate it. In light of the construction given the statute's definition of medical emergency by the Court of Appeals, and the District Court's findings, we cannot say that the waiting period imposes a real health risk.

We also disagree with the District Court's conclusion that the "particularly burdensome" effects of the waiting period [505 U.S. 833, 887] on some women require its invalidation. A particular burden is not, of necessity, a substantial obstacle. Whether a burden falls on a particular group is a distinct inquiry from whether it is a substantial obstacle even as to the women in that group. And the District Court did not conclude that the waiting period is such an obstacle even for the women who are most burdened by it. Hence, on the record before us, and in the context of this facial challenge, we are not convinced that the 24-hour waiting period constitutes an undue burden.

We are left with the argument that the various aspects of the informed consent requirement are unconstitutional because they place barriers in the way of abortion on demand. Even the broadest reading of Roe, however, has not suggested that there is a constitutional right to abortion on demand. See, e.g., Doe v. Bolton, 410 U.S., at 189. Rather, the right protected by Roe is a right to decide to terminate a pregnancy free of undue interference by the State. Because the informed consent requirement facilitates the wise exercise of that right, it cannot be classified as an interference with the right Roe protects. The informed consent requirement is not an undue burden on that right.

C

Section 3209 of Pennsylvania's abortion law provides, except in cases of medical emergency, that no physician shall perform an abortion on a married woman without receiving a signed statement from the woman that she has notified her spouse that she is about to undergo an abortion. The woman has the option of providing an alternative signed statement certifying that her husband is not the man who impregnated her; that her husband could not be located; that the pregnancy is the result of spousal sexual assault which she has reported; or that the woman believes that notifying her husband will cause him or someone else to inflict bodily injury upon her. A physician who performs an abortion on [505 U.S. 833, 888] a married woman without receiving the appropriate signed statement will have his or her license revoked, and is liable to the husband for damages.

The District Court heard the testimony of numerous expert witnesses, and made detailed findings of fact regarding the effect of this statute. These included:

"273. The vast majority of women consult their husbands prior to deciding to terminate their pregnancy. . . .

. . . . .

"279. The "bodily injury" exception could not be invoked by a married woman whose husband, if notified, would, in her reasonable belief, threaten to (a) publicize her intent to have an abortion to family, friends or acquaintances; (b) retaliate against her in future child custody or divorce proceedings; (c) inflict psychological intimidation or emotional harm upon her, her children or other persons; (d) inflict bodily harm on other persons such as children, family members or other loved ones; or (e) use his control over finances to deprive of necessary monies for herself or her children. . . .

. . . . .

"281. Studies reveal that family violence occurs in two million families in the United States. This figure, however, is a conservative one that substantially understates (because battering is usually not reported until it reaches life-threatening proportions) the actual number of families affected by domestic violence. In fact, researchers estimate that one of every two women will be battered at some time in their life. . . .

"282. A wife may not elect to notify her husband of her intention to have an abortion for a variety of reasons, including the husband's illness, concern about her own health, the imminent failure of the marriage, or the husband's absolute opposition to the abortion. . . .

"283. The required filing of the spousal consent form would require plaintiff-clinics to change their counseling [505 U.S. 833, 889] procedures and force women to reveal their most intimate decisionmaking on pain of criminal sanctions. The confidentiality of these revelations could not be guaranteed, since the woman's records are not immune from subpoena. . . .

"284. Women of all class levels, educational backgrounds, and racial, ethnic and religious groups are battered. . . .

"285. Wife-battering or abuse can take on many physical and psychological forms. The nature and scope of the battering can cover a broad range of actions, and be gruesome and torturous. . . .

"286. Married women, victims of battering, have been killed in Pennsylvania and throughout the United States. . . .

"287. Battering can often involve a substantial amount of sexual abuse, including marital rape and sexual mutilation. . . .

"288. In a domestic abuse situation, it is common for the battering husband to also abuse the children in an attempt to coerce the wife. . . .

"289. Mere notification of pregnancy is frequently a flashpoint for battering and violence within the family. The number of battering incidents is high during the pregnancy, and often the worst abuse can be associated with pregnancy. . . . The battering husband may deny parentage and use the pregnancy as an excuse for abuse. . . .

"290. Secrecy typically shrouds abusive families. Family members are instructed not to tell anyone, especially police or doctors, about the abuse and violence. Battering husbands often threaten their wives or her children with further abuse if she tells an outsider of the violence, and tells her that nobody will believe her. A battered woman, therefore, is highly unlikely to disclose [505 U.S. 833, 890] the violence against her for fear of retaliation by the abuser. . . .

"291. Even when confronted directly by medical personnel or other helping professionals, battered women often will not admit to the battering, because they have not admitted to themselves that they are battered. . . .

. . . . .

"294. A woman in a shelter or a safe house unknown to her husband is not "reasonably likely" to have bodily harm inflicted upon her by her batterer; however, her attempt to notify her husband pursuant to section 3209 could accidentally disclose her whereabouts to her husband. Her fear of future ramifications would be realistic under the circumstances.

"295. Marital rape is rarely discussed with others or reported to law enforcement authorities, and of those reported, only few are prosecuted. . . .

"296. It is common for battered women to have sexual intercourse with their husbands to avoid being battered. While this type of coercive sexual activity would be spousal sexual assault as defined by the Act, many women may not consider it to be so, and others would fear disbelief. . . .

"297. The marital rape exception to section 3209 cannot be claimed by women who are victims of coercive sexual behavior other than penetration. The 90-day reporting requirement of the spousal sexual assault statute, 18 Pa.Con.Stat.Ann. 3218(c), further narrows the class of sexually abused wives who can claim the exception, since many of these women may be psychologically unable to discuss or report the rape for several years after the incident. . . .

"298. Because of the nature of the battering relationship, battered women are unlikely to avail themselves of the exceptions to section 3209 of the Act, regardless of [505 U.S. 833, 891] whether the section applies to them. 744 F.Supp., at 1360-1362 (footnote omitted).

These findings are supported by studies of domestic violence. The American Medical Association (AMA) has published a summary of the recent research in this field, which indicates that, in an average 12-month period in this country, approximately two million women are the victims of severe assaults by their male partners. In a 1985 survey, women reported that nearly one of every eight husbands had assaulted their wives during the past year. The AMA views these figures as "marked underestimates," because the nature of these incidents discourages women from reporting them, and because surveys typically exclude the very poor, those who do not speak English well, and women who are homeless or in institutions or hospitals when the survey is conducted. According to the AMA, [r]esearchers on family violence agree that the true incidence of partner violence is probably double the above estimates; or four million severely assaulted women per year. Studies suggest that from one-fifth to one-third of all women will be physically assaulted by a partner or ex-partner during their lifetime. AMA Council on Scientific Affairs, Violence Against Women 7 (1991) (emphasis in original). Thus, on an average day in the United States, nearly 11,000 women are severely assaulted by their male partners. Many of these incidents involve sexual assault. Id., at 3-4; Shields & Hanneke, Battered Wives' Reactions to Marital Rape, in The Dark Side of Families: Current Family Violence Research 131, 144 (D. Finkelhor, R. Gelles, G. Hataling, & M. Straus eds. 1983). In families where wifebeating takes place, moreover, child abuse is often present as well. Violence Against Women, supra, at 12.

Other studies fill in the rest of this troubling picture. Physical violence is only the most visible form of abuse. Psychological abuse, particularly forced social and economic isolation of women, is also common. L. Walker, The Battered [505 U.S. 833, 892] Woman Syndrome 27-28 (1984). Many victims of domestic violence remain with their abusers, perhaps because they perceive no superior alternative. Herbert, Silver, & Ellard, Coping with an Abusive Relationship: I. How and Why do Women Stay?, 53 J. Marriage & the Family 311 (1991). Many abused women who find temporary refuge in shelters return to their husbands, in large part because they have no other source of income. Aguirre, Why Do They Return? Abused Wives in Shelters, 30 J.Nat.Assn. of Social Workers 350, 352 (1985). Returning to one's abuser can be dangerous. Recent Federal Bureau of Investigation statistics disclose that 8.8 percent of all homicide victims in the United States are killed by their spouses. Mercy & Saltzman, Fatal Violence Among Spouses in the United States, 1976-85, 79 Am.J. Public Health 595 (1989). Thirty percent of female homicide victims are killed by their male partners. Domestic Violence: Terrorism in the Home, Hearing before the Subcommittee on Children, Family, Drugs and Alcoholism of the Senate Committee on Labor and Human Resources, 101st Cong., 2d Sess., 3 (1990).

The limited research that has been conducted with respect to notifying one's husband about an abortion, although involving samples too small to be representative, also supports the District Court's findings of fact. The vast majority of women notify their male partners of their decision to obtain an abortion. In many cases in which married women do not notify their husbands, the pregnancy is the result of an extramarital affair. Where the husband is the father, the primary reason women do not notify their husbands is that the husband and wife are experiencing marital difficulties, often accompanied by incidents of violence. Ryan & Plutzer, When Married Women Have Abortions: Spousal Notification and Marital Interaction, 51 J. Marriage & the Family 41, 44 (1989).

This information and the District Court's findings reinforce what common sense would suggest. In well-functioning [505 U.S. 833, 893] marriages, spouses discuss important intimate decisions such as whether to bear a child. But there are millions of women in this country who are the victims of regular physical and psychological abuse at the hands of their husbands. Should these women become pregnant, they may have very good reasons for not wishing to inform their husbands of their decision to obtain an abortion. Many may have justifiable fears of physical abuse, but may be no less fearful of the consequences of reporting prior abuse to the Commonwealth of Pennsylvania. Many may have a reasonable fear that notifying their husbands will provoke further instances of child abuse; these women are not exempt from § 3209's notification requirement. Many may fear devastating forms of psychological abuse from their husbands, including verbal harassment, threats of future violence, the destruction of possessions, physical confinement to the home, the withdrawal of financial support, or the disclosure of the abortion to family and friends. These methods of psychological abuse may act as even more of a deterrent to notification than the possibility of physical violence, but women who are the victims of the abuse are not exempt from § 3209's notification requirement. And many women who are pregnant as a result of sexual assaults by their husbands will be unable to avail themselves of the exception for spousal sexual assault, § 3209(b)(3), because the exception requires that the woman have notified law enforcement authorities within 90 days of the assault, and her husband will be notified of her report once an investigation begins, 3128(c). If anything in this field is certain, it is that victims of spousal sexual assault are extremely reluctant to report the abuse to the government; hence, a great many spousal rape victims will not be exempt from the notification requirement imposed by § 3209.

The spousal notification requirement is thus likely to prevent a significant number of women from obtaining an abortion. It does not merely make abortions a little more difficult or expensive to obtain; for many women, it will impose [505 U.S. 833, 894] a substantial obstacle. We must not blind ourselves to the fact that the significant number of women who fear for their safety and the safety of their children are likely to be deterred from procuring an abortion as surely as if the Commonwealth had outlawed abortion in all cases.

Respondents attempt to avoid the conclusion that § 3209 is invalid by pointing out that it imposes almost no burden at all for the vast majority of women seeking abortions. They begin by noting that only about 20 percent of the women who obtain abortions are married. They then note that, of these women, about 95 percent notify their husbands of their own volition. Thus, respondents argue, the effects of § 3209 are felt by only one percent of the women who obtain abortions. Respondents argue that, since some of these women will be able to notify their husbands without adverse consequences or will qualify for one of the exceptions, the statute affects fewer than one percent of women seeking abortions. For this reason, it is asserted, the statute cannot be invalid on its face. See Brief for Respondents 83-86. We disagree with respondents' basic method of analysis.

The analysis does not end with the one percent of women upon whom the statute operates; it begins there. Legislation is measured for consistency with the Constitution by its impact on those whose conduct it affects. For example, we would not say that a law which requires a newspaper to print a candidate's reply to an unfavorable editorial is valid on its face because most newspapers would adopt the policy even absent the law. See Miami Herald Publishing Co. v. Tornillo, 418 U.S. 241 (1974). The proper focus of constitutional inquiry is the group for whom the law is a restriction, not the group for whom the law is irrelevant.

Respondents' argument itself gives implicit recognition to this principle at one of its critical points. Respondents speak of the one percent of women seeking abortions who are married and would choose not to notify their husbands of their plans. By selecting as the controlling class women [505 U.S. 833, 895] who wish to obtain abortions, rather than all women or all pregnant women, respondents, in effect, concede that § 3209 must be judged by reference to those for whom it is an actual, rather than an irrelevant, restriction. Of course, as we have said, § 3209's real target is narrower even than the class of women seeking abortions identified by the State: it is married women seeking abortions who do not wish to notify their husbands of their intentions and who do not qualify for one of the statutory exceptions to the notice requirement. The unfortunate yet persisting conditions we document above will mean that, in a large fraction of the cases in which § 3209 is relevant, it will operate as a substantial obstacle to a woman's choice to undergo an abortion. It is an undue burden, and therefore invalid.

This conclusion is in no way inconsistent with our decisions upholding parental notification or consent requirements. See, e.g., Akron II, 497 U.S., at 510-519; Bellotti v. Baird, 443 U.S. 622 (1979) (Bellotti II); Planned Parenthood of Central Mo. v. Danforth, 428 U.S., at 74. Those enactments, and our judgment that they are constitutional, are based on the quite reasonable assumption that minors will benefit from consultation with their parents and that children will often not realize that their parents have their best interests at heart. We cannot adopt a parallel assumption about adult women.

We recognize that a husband has a deep and proper concern and interest . . . in his wife's pregnancy and in the growth and development of the fetus she is carrying. Danforth, supra, at 69. With regard to the children he has fathered and raised, the Court has recognized his "cognizable and substantial" interest in their custody. Stanley v. Illinois, 405 U.S. 645, 651-652 (1972); see also Quilloin v. Walcott, 434 U.S. 246 (1978); Caban v. Mohammed, 441 U.S. 380 (1979); Lehr v. Robertson, 463 U.S. 248 (1983). If this case concerned a State's ability to require the mother to notify the father before taking some action with respect to a living [505 U.S. 833, 896] child raised by both, therefore, it would be reasonable to conclude, as a general matter, that the father's interest in the welfare of the child and the mother's interest are equal.

Before birth, however, the issue takes on a very different cast. It is an inescapable biological fact that state regulation with respect to the child a woman is carrying will have a far greater impact on the mother's liberty than on the father's. The effect of state regulation on a woman's protected liberty is doubly deserving of scrutiny in such a case, as the State has touched not only upon the private sphere of the family, but upon the very bodily integrity of the pregnant woman. Cf. Cruzan v. Director, Mo. Dept. of Health, 497 U.S., at 281. The Court has held that, when the wife and the husband disagree on this decision, the view of only one of the two marriage partners can prevail. Inasmuch as it is the woman who physically bears the child and who is the more directly and immediately affected by the pregnancy, as between the two, the balance weighs in her favor. Danforth, supra, at 71. This conclusion rests upon the basic nature of marriage and the nature of our Constitution: [T]he marital couple is not an independent entity with a mind and heart of its own, but an association of two individuals, each with a separate intellectual and emotional makeup. If the right of privacy means anything, it is the right of the individual, married or single, to be free from unwarranted governmental intrusion into matters so fundamentally affecting a person as the decision whether to bear or beget a child. Eisenstadt v. Baird, 405 U.S., at 453 (emphasis in original). The Constitution protects individuals, men and women alike, from unjustified state interference, even when that interference is enacted into law for the benefit of their spouses.

There was a time, not so long ago, when a different understanding of the family and of the Constitution prevailed. In Bradwell v. State, 16 Wall. 130 (1873), three Members of this [505 U.S. 833, 897] Court reaffirmed the common law principle that a woman had no legal existence separate from her husband, who was regarded as her head and representative in the social state; and, notwithstanding some recent modifications of this civil status, many of the special rules of law flowing from and dependent upon this cardinal principle still exist in full force in most States. Id., at 141 (Bradley, J., joined by Swayne and Field, JJ., concurring in judgment). Only one generation has passed since this Court observed that "woman is still regarded as the center of home and family life," with attendant "special responsibilities" that precluded full and independent legal status under the Constitution. Hoyt v. Florida, 368 U.S. 57, 62 (1961). These views, of course, are no longer consistent with our understanding of the family, the individual, or the Constitution.

In keeping with our rejection of the common law understanding of a woman's role within the family, the Court held in Danforth that the Constitution does not permit a State to require a married woman to obtain her husband's consent before undergoing an abortion. 428 U.S., at 69. The principles that guided the Court in Danforth should be our guides today. For the great many women who are victims of abuse inflicted by their husbands, or whose children are the victims of such abuse, a spousal notice requirement enables the husband to wield an effective veto over his wife's decision. Whether the prospect of notification itself deters such women from seeking abortions, or whether the husband, through physical force or psychological pressure or economic coercion, prevents his wife from obtaining an abortion until it is too late, the notice requirement will often be tantamount to the veto found unconstitutional in Danforth. The women most affected by this law - those who most reasonably fear the consequences of notifying their husbands that they are pregnant - are in the gravest danger. [505 U.S. 833, 898]

The husband's interest in the life of the child his wife is carrying does not permit the State to empower him with this troubling degree of authority over his wife. The contrary view leads to consequences reminiscent of the common law. A husband has no enforceable right to require a wife to advise him before she exercises her personal choices. If a husband's interest in the potential life of the child outweighs a wife's liberty, the State could require a married woman to notify her husband before she uses a post-fertilization contraceptive. Perhaps next in line would be a statute requiring pregnant married women to notify their husbands before engaging in conduct causing risks to the fetus. After all, if the husband's interest in the fetus' safety is a sufficient predicate for state regulation, the State could reasonably conclude that pregnant wives should notify their husbands before drinking alcohol or smoking. Perhaps married women should notify their husbands before using contraceptives or before undergoing any type of surgery that may have complications affecting the husband's interest in his wife's reproductive organs. And if a husband's interest justifies notice in any of these cases, one might reasonably argue that it justifies exactly what the Danforth Court held it did not justify - a requirement of the husband's consent as well. A State may not give to a man the kind of dominion over his wife that parents exercise over their children.

Section 3209 embodies a view of marriage consonant with the common law status of married women, but repugnant to our present understanding of marriage and of the nature of the rights secured by the Constitution. Women do not lose their constitutionally protected liberty when they marry. The Constitution protects all individuals, male or female, married or unmarried, from the abuse of governmental power, even where that power is employed for the supposed benefit of a member of the individual's family. These considerations confirm our conclusion that § 3209 is invalid. [505 U.S. 833, 899]

D

We next consider the parental consent provision. Except in a medical emergency, an unemancipated young woman under 18 may not obtain an abortion unless she and one of her parents (or guardian) provides informed consent as defined above. If neither a parent nor a guardian provides consent, a court may authorize the performance of an abortion upon a determination that the young woman is mature and capable of giving informed consent and has, in fact, given her informed consent, or that an abortion would be in her best interests.

We have been over most of this ground before. Our cases establish, and we reaffirm today, that a State may require a minor seeking an abortion to obtain the consent of a parent or guardian, provided that there is an adequate judicial bypass procedure. See, e.g., Akron II, 497 U.S., at 510-519; Hodgson, 497 U.S., at 461 (O'Connor, J., concurring in part and concurring in judgment in part); id., at 497-501 (Kennedy, J., concurring in judgment in part and dissenting in part); Akron I, 462 U.S., at 440; Bellotti II, 443 U.S., at 643-644 (plurality opinion). Under these precedents, in our view, the one-parent consent requirement and judicial bypass procedure are constitutional.

The only argument made by petitioners respecting this provision and to which our prior decisions do not speak is the contention that the parental consent requirement is invalid because it requires informed parental consent. For the most part, petitioners' argument is a reprise of their argument with respect to the informed consent requirement in general, and we reject it for the reasons given above. Indeed, some of the provisions regarding informed consent have particular force with respect to minors: the waiting period, for example, may provide the parent or parents of a pregnant young woman the opportunity to consult with her in private, and to discuss the consequences of her decision in [505 U.S. 833, 900] the context of the values and moral or religious principles of their family. See Hodgson, supra, at 448-449 (opinion of Stevens, J.)

E

Under the recordkeeping and reporting requirements of the statute, every facility which performs abortions is required to file a report stating its name and address as well as the name and address of any related entity, such as a controlling or subsidiary organization. In the case of state-funded institutions, the information becomes public.

For each abortion performed, a report must be filed identifying: the physician (and the second physician where required); the facility; the referring physician or agency; the woman's age; the number of prior pregnancies and prior abortions she has had; gestational age; the type of abortion procedure; the date of the abortion; whether there were any preexisting medical conditions which would complicate pregnancy; medical complications with the abortion; where applicable, the basis for the determination that the abortion was medically necessary; the weight of the aborted fetus; and whether the woman was married, and if so, whether notice was provided or the basis for the failure to give notice. Every abortion facility must also file quarterly reports showing the number of abortions performed broken down by trimester. See 18 Pa.Cons.Stat. § 3207, 3214 (1990). In all events, the identity of each woman who has had an abortion remains confidential.

In Danforth, 428 U.S., at 80, we held that recordkeeping and reporting provisions that are reasonably directed to the preservation of maternal health and that properly respect a patient's confidentiality and privacy are permissible. We think that, under this standard, all the provisions at issue here except that relating to spousal notice are constitutional. Although they do not relate to the State's interest in informing the woman's choice, they do relate to health. The collection of information with respect to actual patients [505 U.S. 833, 901] is a vital element of medical research, and so it cannot be said that the requirements serve no purpose other than to make abortions more difficult. Nor do we find that the requirements impose a substantial obstacle to a woman's choice. At most, they might increase the cost of some abortions by a slight amount. While at some point increased cost could become a substantial obstacle, there is no such showing on the record before us.

Subsection (12) of the reporting provision requires the reporting of, among other things, a married woman's "reason for failure to provide notice" to her husband. 3214(a)(12). This provision in effect requires women, as a condition of obtaining an abortion, to provide the Commonwealth with the precise information we have already recognized that many women have pressing reasons not to reveal. Like the spousal notice requirement itself, this provision places an undue burden on a woman's choice, and must be invalidated for that reason.

VI

Our Constitution is a covenant running from the first generation of Americans to us, and then to future generations. It is a coherent succession. Each generation must learn anew that the Constitution's written terms embody ideas and aspirations that must survive more ages than one. We accept our responsibility not to retreat from interpreting the full meaning of the covenant in light of all of our precedents. We invoke it once again to define the freedom guaranteed by the Constitution's own promise, the promise of liberty.

* * *

The judgment in No. 91-902 is affirmed. The judgment in No. 91-744 is affirmed in part and reversed in part, and the case is remanded for proceedings consistent with this opinion, including consideration of the question of severability.