Understanding Normal PAPPA Levels During Pregnancy: A Comprehensive Guide

The normal range of serum PAPPA (pregnancy-associated plasma protein-A) levels during pregnancy varies depending on the laboratory and the gestational age.

Generally, PAPPA levels increase steadily throughout the first trimester and reach a peak in the second trimester, typically between 10 to 14 weeks of gestation. This peak is followed by a gradual decline in the third trimester.

The typical reference ranges for PAPPA levels in IU/L (international units per liter) by gestational age are as follows:

- First trimester (5-10 weeks): 0.3-1.5 IU/L

- Second trimester (11-20 weeks): 1.5-10 IU/L

- Third trimester (21-40 weeks): 0.5-5 IU/L

Please note that these reference ranges may vary slightly between different laboratories and it's important to consult with your healthcare provider for specific interpretation of your PAPPA levels within the context of your overall prenatal care.