Cite as: 505 U. S. 833 (1992)
Syllabus
subsequent cases, reveals a number of guiding principles that should control the assessment of the Pennsylvania statute: (a) To protect the central right recognized by Roe while at the same time accommodating the State's profound interest in potential life, see id., at 162, the undue burden standard should be employed. An undue burden exists, and therefore a provision of law is invalid, if its purpose or effect is to place substantial obstacles in the path of a woman seeking an abortion before the fetus attains viability. (b) Roe's rigid trimester framework is rejected. To promote the State's interest in potential life throughout pregnancy, the State may take measures to ensure that the woman's choice is informed. Measures designed to advance this interest should not be invalidated if their purpose is to persuade the woman to choose childbirth over abortion. These measures must not be an undue burden on the right. (c) As with any medical procedure, the State may enact regulations to further the health or safety of a woman seeking an abortion, but may not impose unnecessary health regulations that present a substantial obstacle to a woman seeking an abortion. (d) Adoption of the undue burden standard does not disturb Roe's holding that regardless of whether exceptions are made for particular circumstances, a State may not prohibit any woman from making the ultimate decision to terminate her pregnancy before viability. (e) Roe's holding that "subsequent to viability, the State in promoting its interest in the potentiality of human life may, if it chooses, regulate, and even proscribe, abortion except where it is necessary, in appropriate medical judgment, for the preservation of the life or health of the mother" is also reaffirmed. Id., at 164-165. Pp. 869-879.
Justice O'Connor, Justice Kennedy, and Justice Souter delivered the opinion of the Court with respect to Parts V-A and V-C, concluding that: 1. As construed by the Court of Appeals, § 3203's medical emergency definition is intended to assure that compliance with the State's abortion regulations would not in any way pose a significant threat to a woman's life or health, and thus does not violate the essential holding of Roe, supra, at 164. Although the definition could be interpreted in an unconstitutional manner, this Court defers to lower federal court interpretations of state law unless they amount to "plain" error. Pp. 879-880. 2. Section 3209's husband notification provision constitutes an undue burden and is therefore invalid. A significant number of women will likely be prevented from obtaining an abortion just as surely as if Pennsylvania had outlawed the procedure entirely. The fact that § 3209 may affect fewer than one percent of women seeking abortions does not save it from facial invalidity, since the proper focus of constitutional inquiry
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