[508]*508Justice Powell
delivered the opinion of the Court.
We have considered today mandatory hospitalization requirements for second-trimester abortions in City of Akron v. Akron Center for Reproductive Health, Inc., ante, p. 416, and Planned Parenthood Assn. of Kansas City, Mo., Inc. v. Ashcroft, ante, p. 476. The principal issue here is whether Virginia’s mandatory hospitalization requirement is constitutional.
I
Appellant is a practicing obstetrician-gynecologist certified by the American Board of Obstetrics and Gynecology. In November 1979, he practiced at his office in Woodbridge, Va., at four local hospitals, and at his clinic in Falls Church, Va. The Falls Church clinic has an operating room and facilities for resuscitation and emergency treatment of cardiac/ respiratory arrest. Replacement and stabilization fluids are on hand. Appellant customarily performs first-trimester abortions at his clinic. During the time relevant to this case, the clinic was not licensed, nor had appellant sought any license for it.
P. M. was a 17-year-old high school student when she went to appellant’s clinic on November 8, 1979. She was unmarried, and told appellant that she was approximately 22 weeks pregnant. She requested an abortion but did not want her parents to know. Examination by appellant confirmed that P. M. was five months pregnant, well into the second trimester. Appellant testified that he encouraged her to confer with her parents and discussed with her the alternative of continuing the pregnancy to term. She did return home, but never advised her parents of her decision.
Two days later, P. M. returned to the clinic with her boyfriend. The abortion was performed by an injection of saline solution. P. M. told appellant that she planned to deliver the fetus in a motel, and understood him to agree to this course. Appellant gave P. M. a prescription for an analgesic and a “Post-Injection Information” sheet that stated that she had [509]*509undergone “a surgical procedure” and warned of a “wide range of normal reactions.” App. 199. The sheet also advised that she call the physician if “heavy” bleeding began. Although P. M. did not recall being advised to go to a hospital when labor began, this was included on the instruction sheet. Id., at 200.
P. M. went to a motel. Alone, she aborted her fetus in the motel bathroom 48 hours after the saline injection. She left the fetus, followup instructions, and pain medication in the wastebasket at the motel. Her boyfriend took her home. Police found the fetus later that day and began an investigation.1
Appellant was indicted2 for unlawfully performing an abortion during the second trimester of pregnancy outside of a licensed hospital and was convicted by the Circuit Court of Fair-fax County sitting without a jury. The Supreme Court of Virginia unanimously affirmed the conviction. 221 Va. 1059, [510]*510277 S. E. 2d 194 (1981). This appeal followed. We noted probable jurisdiction, 456 U. S. 988, and now affirm.
h-1 HH
Appellant raises two issues that do not require extended treatment. He first contends that Va. Code § 18.2-71 (1982) was applied unconstitutionally to him, because lack of medical necessity for the abortion was not alleged in the indictment, addressed in the prosecution’s case, or mentioned by the trier of fact. Appellant contends that this failure renders his conviction unconstitutional for two reasons: (i) the State failed to meet its burden of alleging necessity in the indictment, as required by United States v. Vuitch, 402 U. S. 62 (1971); and (ii) the prosecution failed to meet its burden of persuasion, as required by Patterson v. New York, 432 U. S. 197 (1977).
The authoritative construction of § 18.2-71 by the Supreme Court of Virginia makes it clear that, at least with respect to the defense of medical necessity, the prosecution was not obligated to prove lack of medical necessity beyond a reasonable doubt until appellant invoked medical necessity as a defense. See 221 Va., at 1069, 277 S. E. 2d, at 200. Appellant’s reliance on Vuitch thus is misplaced: the District of Columbia statute in Vuitch, as construed by this Court, required the prosecution to make this allegation. See 402 U. S., at 70. Placing upon the defendant the burden of going forward with evidence on an affirmative defense is normally permissible. See Engle v. Isaac, 456 U. S. 107, 120-121, and n. 20 (1982); Mullaney v. Wilbur, 421 U. S. 684, 701-703, nn. 28, 30, 31 (1975).
Appellant also contends that the prosecution failed to prove that his acts in fact caused the death of the fetus. In view of the undisputed facts proved at trial, summarized above, this contention is meritless. See 221 Va., at 1069-1070, 277 S. E. 2d, at 200-201.
r-H H-i I — <
We consistently have recognized and reaffirm today that a State has an “important and legitimate interest in the health [511]*511of the mother” that becomes “‘compelling’ ... at approximately the end of the first trimester.” Roe v. Wade, 410 U. S. 113, 163 (1973). See City of Akron, ante, at 428. This interest embraces the facilities and circumstances in which abortions are performed. See 410 U. S., at 150. Appellant argues, however, that Virginia prohibits all nonhospital second-trimester abortions and that such a requirement imposes an unconstitutional burden on the right of privacy. In City of Akron and Ashcroft, we upheld such a constitutional challenge to the acute-care hospital requirements at issue there. The State of Virginia argues here that its hospitalization requirement differs significantly from the hospitalization requirements considered in City of Akron and Ashcroft and that it reasonably promotes the State’s interests.
A
In furtherance of its compelling interest in maternal health, Virginia has enacted a hospitalization requirement for abortions performed during the second trimester. As a general proposition, physicians’ offices are not regulated under Virginia law.3 Virginia law does not, however, permit a [512]*512physician licensed in the practice of medicine and surgery to perform an abortion during the second trimester of pregnancy unless “such procedure is performed in a hospital licensed by the State Department of Health.” Va. Code § 18.2-73 (1982). The Virginia abortion statute itself does not define the term “hospital.” This definition is found in Va. Code §32.1-123.1 (1979),4 that defines “hospital” to include “outpatient . . . hospitals.”5 Section 20.2.11 of the [513]*513Department of Health’s Rules and Regulations for the Licen-sure of Outpatient Hospitals in Virginia (1977) (regulations)6 [514]*514defines “outpatient hospitals” in pertinent part as “[institutions . . .
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[508]*508Justice Powell
delivered the opinion of the Court.
We have considered today mandatory hospitalization requirements for second-trimester abortions in City of Akron v. Akron Center for Reproductive Health, Inc., ante, p. 416, and Planned Parenthood Assn. of Kansas City, Mo., Inc. v. Ashcroft, ante, p. 476. The principal issue here is whether Virginia’s mandatory hospitalization requirement is constitutional.
I
Appellant is a practicing obstetrician-gynecologist certified by the American Board of Obstetrics and Gynecology. In November 1979, he practiced at his office in Woodbridge, Va., at four local hospitals, and at his clinic in Falls Church, Va. The Falls Church clinic has an operating room and facilities for resuscitation and emergency treatment of cardiac/ respiratory arrest. Replacement and stabilization fluids are on hand. Appellant customarily performs first-trimester abortions at his clinic. During the time relevant to this case, the clinic was not licensed, nor had appellant sought any license for it.
P. M. was a 17-year-old high school student when she went to appellant’s clinic on November 8, 1979. She was unmarried, and told appellant that she was approximately 22 weeks pregnant. She requested an abortion but did not want her parents to know. Examination by appellant confirmed that P. M. was five months pregnant, well into the second trimester. Appellant testified that he encouraged her to confer with her parents and discussed with her the alternative of continuing the pregnancy to term. She did return home, but never advised her parents of her decision.
Two days later, P. M. returned to the clinic with her boyfriend. The abortion was performed by an injection of saline solution. P. M. told appellant that she planned to deliver the fetus in a motel, and understood him to agree to this course. Appellant gave P. M. a prescription for an analgesic and a “Post-Injection Information” sheet that stated that she had [509]*509undergone “a surgical procedure” and warned of a “wide range of normal reactions.” App. 199. The sheet also advised that she call the physician if “heavy” bleeding began. Although P. M. did not recall being advised to go to a hospital when labor began, this was included on the instruction sheet. Id., at 200.
P. M. went to a motel. Alone, she aborted her fetus in the motel bathroom 48 hours after the saline injection. She left the fetus, followup instructions, and pain medication in the wastebasket at the motel. Her boyfriend took her home. Police found the fetus later that day and began an investigation.1
Appellant was indicted2 for unlawfully performing an abortion during the second trimester of pregnancy outside of a licensed hospital and was convicted by the Circuit Court of Fair-fax County sitting without a jury. The Supreme Court of Virginia unanimously affirmed the conviction. 221 Va. 1059, [510]*510277 S. E. 2d 194 (1981). This appeal followed. We noted probable jurisdiction, 456 U. S. 988, and now affirm.
h-1 HH
Appellant raises two issues that do not require extended treatment. He first contends that Va. Code § 18.2-71 (1982) was applied unconstitutionally to him, because lack of medical necessity for the abortion was not alleged in the indictment, addressed in the prosecution’s case, or mentioned by the trier of fact. Appellant contends that this failure renders his conviction unconstitutional for two reasons: (i) the State failed to meet its burden of alleging necessity in the indictment, as required by United States v. Vuitch, 402 U. S. 62 (1971); and (ii) the prosecution failed to meet its burden of persuasion, as required by Patterson v. New York, 432 U. S. 197 (1977).
The authoritative construction of § 18.2-71 by the Supreme Court of Virginia makes it clear that, at least with respect to the defense of medical necessity, the prosecution was not obligated to prove lack of medical necessity beyond a reasonable doubt until appellant invoked medical necessity as a defense. See 221 Va., at 1069, 277 S. E. 2d, at 200. Appellant’s reliance on Vuitch thus is misplaced: the District of Columbia statute in Vuitch, as construed by this Court, required the prosecution to make this allegation. See 402 U. S., at 70. Placing upon the defendant the burden of going forward with evidence on an affirmative defense is normally permissible. See Engle v. Isaac, 456 U. S. 107, 120-121, and n. 20 (1982); Mullaney v. Wilbur, 421 U. S. 684, 701-703, nn. 28, 30, 31 (1975).
Appellant also contends that the prosecution failed to prove that his acts in fact caused the death of the fetus. In view of the undisputed facts proved at trial, summarized above, this contention is meritless. See 221 Va., at 1069-1070, 277 S. E. 2d, at 200-201.
r-H H-i I — <
We consistently have recognized and reaffirm today that a State has an “important and legitimate interest in the health [511]*511of the mother” that becomes “‘compelling’ ... at approximately the end of the first trimester.” Roe v. Wade, 410 U. S. 113, 163 (1973). See City of Akron, ante, at 428. This interest embraces the facilities and circumstances in which abortions are performed. See 410 U. S., at 150. Appellant argues, however, that Virginia prohibits all nonhospital second-trimester abortions and that such a requirement imposes an unconstitutional burden on the right of privacy. In City of Akron and Ashcroft, we upheld such a constitutional challenge to the acute-care hospital requirements at issue there. The State of Virginia argues here that its hospitalization requirement differs significantly from the hospitalization requirements considered in City of Akron and Ashcroft and that it reasonably promotes the State’s interests.
A
In furtherance of its compelling interest in maternal health, Virginia has enacted a hospitalization requirement for abortions performed during the second trimester. As a general proposition, physicians’ offices are not regulated under Virginia law.3 Virginia law does not, however, permit a [512]*512physician licensed in the practice of medicine and surgery to perform an abortion during the second trimester of pregnancy unless “such procedure is performed in a hospital licensed by the State Department of Health.” Va. Code § 18.2-73 (1982). The Virginia abortion statute itself does not define the term “hospital.” This definition is found in Va. Code §32.1-123.1 (1979),4 that defines “hospital” to include “outpatient . . . hospitals.”5 Section 20.2.11 of the [513]*513Department of Health’s Rules and Regulations for the Licen-sure of Outpatient Hospitals in Virginia (1977) (regulations)6 [514]*514defines “outpatient hospitals” in pertinent part as “[institutions . . . which primarily provide facilities for the performance of surgical procedures on outpatients”7 and provides that second-trimester abortions may be performed in these clinics.8 Thus, under Virginia law, a second-trimester abor[515]*515tion may be performed in an outpatient surgical hospital provided that facility has been licensed as a “hospital” by the State.
The Virginia regulations applicable to the performance of second-trimester abortions in outpatient surgical hospitals are, with few exceptions, the same regulations applicable to all outpatient surgical hospitals in Virginia, and may be grouped for purposes of discussion into three main categories. The first grouping relates to organization, management, policies, procedures, and staffing. These regulations require personnel and facilities “necessary to meet patient and program needs.” Va. Regs. (Outpatient Hospitals) §40.3 (1977); see also §40.1. They also require a policy and procedures manual, §43.2, an administrative officer, §40.6, a licensed physician who must supervise clinical services and perform surgical procedures, § 42.1, and a registered nurse to be on duty at all times while the facility is in use, § 42.2. The second category of requirements outlines construction standards for outpatient surgical clinics, but also provides that “deviations from the requirements prescribed herein may be approved if it is determined that the purposes of the minimum requirements have been fulfilled,” § 50.2.1. There are also construction requirements that set forth standards for the public areas, clinical areas, laboratory and radiology serv[516]*516ices, §§52.1, 52.2, 52.3, and general building, §§50.6.1, 50.7.1, 50.8.1, 52.4. The final group of regulations relates to patient care services. Most of these set the requirements for various services that the facility may offer, such as anesthesia, §43.1, laboratory, §§43.6.1, 64.1.3, 64.1.4, and pathology, §§43.6.3, 64.2.4. Some of the requirements relate to sanitation, laundry, and the physical plant. §§ 43.2, 43.10, 43.11, 43.12.6. There are also guidelines on medical records, §43.7, preoperative admission, §43.8, and postoperative recovery, § 43.9. Finally, the regulations mandate some emergency services and evacuation planning. §§43.4.1, 43.5.
B
It is readily apparent that Virginia’s second-trimester hospitalization requirement differs from those at issue in City of Akron, ante, at 431-432, and Planned Parenthood Assn. of Kansas City, Mo., Inc. v. Ashcroft, ante, at 481. In those cases, we recognized the medical fact that, “at least during the early weeks of the second trimester[,] D&E abortions may be performed as safely in an outpatient clinic as in a full-service hospital.” City of Akron, ante, at 437. The requirements at issue, however, mandated that “all second-trimester abortions must be performed in general, acute-care facilities.” Ashcroft, ante, at 481. In contrast, the Virginia statutes and regulations do not require that second-trimester abortions be performed exclusively in full-service hospitals. Under Virginia's hospitalization requirement, outpatient surgical hospitals may qualify for licensing as “hospitals” in which second-trimester abortions lawfully may be performed. Thus, our decisions in City of Akron and Ashcroft are not controlling here.
In view of its interest in protecting the health of its citizens, the State necessarily has considerable discretion in determining standards for the licensing of medical facilities. Although its discretion does not permit it to adopt abortion regulations that depart from accepted medical practice, it does have a legitimate interest in regulating second-trimester [517]*517abortions and setting forth the standards for facilities in which such abortions are performed.
On their face, the Virginia regulations appear to be generally compatible with accepted medical standards governing outpatient second-trimester abortions. The American Public Health Association (APHA) (Resolution No. 7907), although recognizing “that greater use of the Dilatation and Evacuation procedure makes it possible to perform the vast majority of second trimester abortions during or prior to the 16th week after the last menstrual period,” still “[u]rges endorsement of the provision of second trimester abortion in free-standing qualified clinics that meet the state standards required for certification.” APHA, The Right to Second Trimester Abortion 1, 2 (1979). The medical profession has not thought that a State’s standards need be relaxed merely because the facility performs abortions: “Ambulatory care facilities providing abortion services should meet the same standards of care as those recommended for other surgical procedures performed in the physician’s office and outpatient clinic or the free-standing and hospital-based ambulatory setting.” American College of Obstetricians and Gynecologists (ACOG), Standards for Obstetric-Gynecologic Services 54 (5th ed. 1982). See also id., at 52 (“Free-standing or hospital-based ambulatory surgical facilities should be licensed to conform to requirements of state or federal legislation”). Indeed, the medical profession’s standards for outpatient surgical facilities are stringent: “Such facilities should maintain the same surgical, anesthetic, and personnel standards as recommended for hospitals.” Ibid.
We need not consider whether Virginia’s regulations are constitutional in every particular. Despite personal knowledge of the regulations at least by the time of trial, appellant has not attacked them as being insufficiently related to the State’s interest in protecting health.9 His challenge [518]*518throughout this litigation appears to have been limited to an assertion that the State cannot require all second-trimester abortions to be performed in full-service general hospitals. In essence, appellant has argued that Virginia’s hospitalization requirements are no different in substance from those reviewed in the City of Akron and Ashcroft cases.10 At the same time, however, appellant took the position — both before the Virginia courts and this Court — that a state licensing requirement for outpatient abortion facilities would be constitutional.11 We can only assume that by continuing to challenge the Virginia hospitalization requirement appellant either views the Virginia regulations in some unspecified way as unconstitutional or challenges a hospitalization requirement that does not exist in Virginia. Yet, not until his reply brief in this Court did he elect to criticize the regulations apart from his broadside attack on the entire Virginia hospitalization requirement.
Given the plain language of the Virginia regulations and the history of their adoption, see n. 6, swpra, we see no reason to doubt that an adequately equipped clinic could, upon [519]*519proper application, obtain an outpatient hospital license permitting the performance of second-trimester abortions. We conclude that Virginia’s requirement that second-trimester abortions be performed in licensed clinics is not an unreasonable means of furthering the State’s compelling interest in “protecting the woman’s own health and safety.” Roe, 410 U. S., at 150.12 As we emphasized in Roe, “[t]he State has a legitimate interest in seeing to it that abortion, like any other medical procedure, is performed under circumstances that insure maximum safety for the patient.” Ibid. Unlike the provisions at issue in City of Akron and Ashcroft, Virginia’s statute and regulations do not require that the patient be hospitalized as an inpatient or that the abortion be performed in a full-service, acute-care hospital. Rather, the State’s requirement that second-trimester abortions be performed in licensed clinics appears to comport with accepted medical practice, and leaves the method and timing of the abortion precisely where they belong — with the physician and the patient.
IV
The judgment of the Supreme Court of Virginia is
Affirmed.