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Hormone Inhibin A Test

Test Overview

The inhibin A test is done to measure the amount of this hormone, Opens dialog in a pregnant woman's blood to see if the baby may have Down syndrome, Opens dialog. Inhibin A is made by the placenta, Opens dialog during pregnancy.

The level of inhibin A in the blood is used in a maternal serum quadruple screening test. Generally done between 15 and 22 weeks, this test checks the levels of four substances in a pregnant woman's blood. The quad screen checks alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), a type of estrogen (unconjugated estriol, or 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.

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Why It Is Done

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

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