The inhibin A hormone is produced by the placenta in a pregnant woman. The test that measures the inhibin A levels in the pregnant woman’s blood is used as a screening test to check whether the growing baby has Down syndrome. A maternal serum quadruple screening test, in which inhibin A levels are measured in the blood, is usually performed between 15 and 20 weeks into the pregnancy.
Why is the test ordered?
The test may be ordered as a maternal screening test along with some other tests to screen a pregnant woman for chromosomal abnormalities or genetic disorders like the Down syndrome.
When is the test ordered?
The inhibin A test may be ordered along with an inhibin B Test to investigate the possibility of complications occurring during pregnancy. The test may also be indicated if a pregnant woman has a family history of the Down syndrome.
How is the sample collected?
A blood sample is collected from a vein in the arm.
How to prepare for the test?
No specific preparations are required for this test.