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Clinical Chemistry 28: 50-53, 1982;
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Clinical Chemistry, Vol 28, 50-53, Copyright © 1982 by American Association for Clinical Chemistry

Radioimmunoassay for pregnancy-associated plasma protein A

MJ Sinosich, B Teisner, J Folkersen, DM Saunders and JG Grudzinskas

A specific and highly sensitive radioimmunoassay for determination of pregnancy-associated plasma protein A in human serum is described. The minimum detection limit for this protein was 2.9 micrograms/L. The within- and between-assay coefficients of variation were 4.0 and 4.5%, respectively. The circulating protein was detected within 32 days of conception in eight normal pregnancies and within 21 days in a twin pregnancy. Circulating concentrations in the mother at term were consistently higher (10-fold) than in matched amniotic fluid; none was detected in the umbilical circulation. This protein was also detected in the circulation of patients with hydatiform mole. This assay will permit investigations into the clinical evaluation of measurements of the protein during early pregnancy and trophoblastic disease.


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Copyright © 1982 by the American Association for Clinical Chemistry.