Second trimester maternal serum pregnanc
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Petrocik, Elizabeth ;Wassman, E. Robert ;Lee, J. Jack ;Kelly, JoAnn C.
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Article
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1990
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John Wiley and Sons
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English
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## Abstract Maternal serum pregnancy specific betaโ1 glycoprotein (SPโ1) levels in the second trimester may be predictive of Down syndrome (DS). An enzyme immunoassay was used to measure SPโ1 sera from 46 DS pregnancies and 117 normal control women matched for maternal age, gestational age, and len