Serum Inhibin A Test
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The inhibin A test is done to see if the baby may have Down syndrome. Generally done between 15 and 20 weeks, this test checks the levels of four substances in a pregnant woman’s blood. The quad screen checks AFP, hCG, uE3, and the hormone inhibin A. The levels of these substances- along with a woman’s age and other factors – help the doctor estimate the chance that the baby may have certain problems or birth defects.