Serum Pregnancy-Specific Glycoprotein (Pregnancy-Associated Alpha-1 Glycoprotein, or PA1G)

Your healthcare provider may order a PA1G test to help investigate unexplained symptoms, check for a suspected condition, screen you as part of routine care, or monitor a medical condition you already have.

Your healthcare provider may order a PA1G test if you are pregnant, especially in the first trimester, to evaluate early pregnancy outcomes. It may also be used alongside other tests to screen for conditions like ectopic pregnancy or gestational trophoblastic disease.

The PA1G test measures the amount or presence of PA1G in your blood sample. Depending on the laboratory, your result may be reported as positive or negative, or as a numeric level compared with a reference range.

PA1G is a glycoprotein released by the placenta. Elevated levels can sometimes indicate normal pregnancy progression, while very low or absent levels may suggest issues such as miscarriage or an ectopic pregnancy.

A PA1G test usually requires a small blood sample drawn from a vein in your arm. Follow any instructions from your provider, such as whether you need to fast, avoid certain medications, or drink plenty of water beforehand.

A blood sample is drawn from a vein in your arm. The serum portion (liquid part after clotting) is separated and sent to the lab for analysis.

PA1G results are generally reported as positive or elevated, negative or normal, or borderline. Your provider will interpret your result together with your symptoms, medical history, physical exam, and other test findings.

Results are qualitative (positive/negative) or semi-quantitative, meaning they may indicate presence or relative amount rather than a precise numeric value. Interpretation depends on clinical context and other tests.