Hormone Inhibin is associated with reproduction and it has two types: Inhibin A and Inhibin B. Females have both inhibin types but males have only inhibin B. 
What is an Inhibin A test?
The Inhibin A test measures the levels of the hormone in your blood.
- In women, Inhibin A is secreted by the main follicles and inhibin B by the smaller ones. 
- In men, inhibin B is produced by the testicles.
- Levels of Inhibin help understand the functioning of the reproductive organs in women.
Inhibin A is part of the quad test done to detect the risk of abnormalities in a fetus.
Why is an Inhibin A test suggested?
The Inhibin A test is suggested in the following cases:
- When a woman’s ovaries are not functioning properly.
- During pregnancy to detect if all is well with the baby.
- Increased levels of Inhibin A indicate ovarian cancers, granulosa cell, and other epithelial cell tumors.
How is an Inhibin A performed?
The Inhibin A test is done using an immunoassay method.
- The area on the forearm where blood will be drawn from is cleaned using an antiseptic.
- An elastic band is tied right above the area of intended puncture.
- Blood is drawn from a vein using a needle and syringe.
The collected blood is sent for detecting the amount of Inhibin A.
What are the parameters measured in the Inhibin A test?
The inhibin A levels in the blood are important because high levels indicate:
- Serious abnormality in the fetus when done in a quad test.
- Down’s syndrome when done in the second trimester.
Preparation before performing Inhibin A test
There is no preparation needed for an Inhibin A test.
Post-care after Inhibin A test
There are no post-care measures after an Inhibin A blood test.
Sample types in Inhibin A test
For an Inhibin A test:
- A Blood sample is needed.
Side effects/risks of Inhibin A test
There are no major side effects/risks associated with an Inhibin A test. Minor ones include: 
- Excessive bleeding.
- Infection at the puncture site.