Serum Inhibin A Test

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.

Usually the Inhibin A test does not require any special preparation but, in some cases fasting is required for some period as advised by a doctor. Besides that it is also important to inform your doctor about allergies and medications you are taking as they can affect the Inhibin A test results.