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Placental protein 12 (PP12): a new test for the prediction of the small‐for‐gestational‐age infant

Summary. The circulating levels of placental protein 12 (PP12) and placental lactogen (hPL) were measured in 501 women between 36 and 41 weeks gestation. There was a significant positive association between hPL levels and infant birthweight and a significant negative association in the case of PP12 levels. The clinical efficiency of elevated PP12 levels in the prediction of low‐birthweight infant at term compared favourably with that of reduced hPL levels.