Cite as: 505 U. S. 833 (1992)
Opinion of Rehnquist, C. J.
require that such abortions be performed only in hospitals. See Akron v. Akron Center for Reproductive Health, supra, at 437-439; Planned Parenthood Assn. of Kansas City, Mo., Inc. v. Ashcroft, supra, at 481-482. Despite the fact that Roe expressly allowed regulation after the first trimester in furtherance of maternal health, " 'present medical knowledge,' " in our view, could not justify such a hospitalization requirement under the trimester framework. Akron v. Akron Center for Reproductive Health, supra, at 437 (quoting Roe v. Wade, supra, at 163). And in Danforth, the Court held that Missouri could not outlaw the saline amniocentesis method of abortion, concluding that the Missouri Legislature had "failed to appreciate and to consider several significant facts" in making its decision. 428 U. S., at 77.
Although Roe allowed state regulation after the point of viability to protect the potential life of the fetus, the Court subsequently rejected attempts to regulate in this manner. In Colautti v. Franklin, 439 U. S. 379 (1979), the Court struck down a statute that governed the determination of viability. Id., at 390-397. In the process, we made clear that the trimester framework incorporated only one definition of viability—ours—as we forbade States to decide that a certain objective indicator—"be it weeks of gestation or fetal weight or any other single factor"—should govern the definition of viability. Id., at 389. In that same case, we also invalidated a regulation requiring a physician to use the abortion technique offering the best chance for fetal survival when performing postviability abortions. See id., at 397- 401; see also Thornburgh v. American College of Obstetricians and Gynecologists, 476 U. S., at 768-769 (invalidating a similar regulation). In Thornburgh, the Court struck down Pennsylvania's requirement that a second physician be present at postviability abortions to help preserve the health of the unborn child, on the ground that it did not incorporate a sufficient medical emergency exception. Id., at 769-771. Regulations governing the treatment of aborted fetuses have
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