Considerations on the Definition of Viability

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Abstract
Two relatively recent events in American society have prompted a consideration of the definition of viability of the human fetus. One event is the liberalization of indications for abortion, and the inevitability of an occasional error in calculation of gestational age. Although the error is reduced by use of ultrasound to measure fetal head diameter, and by careful clinical assessment, nonetheless infants of 600 to 700 g are sometimes the product of an elective abortion. The other event is the application of intensive care and technical advances permitting the occasional survival of a 700-g infant, and the increasingly frequent intact . . .

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