[Specificity of biochemical markers of pregnancy second trimester].

Abstract

BACKGROUND During the second trimester of 21 trisomy pregnancies, median of maternal serum concentrations of alpha-fetoprotein, not conjugated estriol, beta fraction, and inhibin A differ from normal values, and it can be used to select high risk patients. OBJECTIVE To evaluate specificity of different forms of second trimester biochemical markers… (More)

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