Prenatal biochemical screening for Down's syndrome and neural tube defects.

Abstract

Antenatal serum screening for Down's syndrome is now becoming established in many centers throughout the world. The screening method is based on the measurement of alpha-fetoprotein, unconjugated estriol, and human chorionic gonadotropin between 15 and 22 weeks of pregnancy. These measurements, used in conjunction with a woman's age, provide risk estimates… (More)

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