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Am J Obstet Gynecol. 1983 Jan 1;145(1):67-9.

Pregnancy-associated plasma protein A in the prediction of early pregnancy failure.


Maternal circulating pregnancy-associated plasma protein A (PAPP-A) was measured in 51 patients with vaginal bleeding in the first half of pregnancy. Concentrations of PAPP-A were consistently lower in pregnancies which failed. In the prediction of early pregnancy failure, the predictive value of depressed maternal PAPP-A levels was 58%, the sensitivity was 91.9%, and specificity was 95.1%. These results compared favorably with other biochemical tests of placental function. However, if fetal life was demonstrated ultrasonically, depressed levels of PAPP-A substantially differentiated between those pregnancies which continued normally and those which did not, suggesting that PAPP-A estimations would be of clinical value in cases previously beyond the reach of any diagnostic measure.

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