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Inhibin A (Serum or Plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the levels of inhibin A, a protein produced by the ovaries and testes that plays a role in regulating reproductive hormones.

Quick summary

["Inhibin A helps assess fertility and ovarian/testicular function."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
36905-8
Short code
Inhibin A unadj MoM SerPl
Synonyms
Inhibin A unadj MoM SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is Inhibin A Used For?

Inhibin A is primarily measured in blood samples to evaluate reproductive health. It can help diagnose conditions affecting ovulation, fertility issues, or monitor ovarian reserve in women. In men, it may be used to assess testicular function or conditions like testicular cancer.

Who Might Need This Test?

Your healthcare provider may recommend an inhibin A test if you have symptoms like irregular periods, difficulty becoming pregnant, or if you’re undergoing fertility treatments. It may also be part of a screening for ovarian or testicular disorders.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed using an immunoassay method to measure inhibin A levels.

What Do Results Mean?

Results are compared to general reference ranges, but they can vary based on age, sex, and medical history. High levels may indicate certain ovarian or testicular conditions, while low levels could suggest reproductive hormone imbalances or other health concerns.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Inhibin A serves as a biomarker for ovarian reserve in women and testicular function in men. It can help guide fertility treatments, diagnose hormonal imbalances, or monitor conditions like polycystic ovary syndrome (PCOS) or ovarian tumors.

Short name

Inhibin A

Frequently asked questions

Why might my inhibin A test be ordered?
Your provider might order this test if you’re experiencing fertility issues, irregular menstrual cycles, or if you’re undergoing fertility treatments. It may also be part of a broader evaluation for reproductive health concerns.
What are the typical reference ranges for inhibin A?
Reference ranges can vary by lab and individual factors. Your results will be interpreted in the context of your specific health profile, rather than a single numeric range.
Can I eat or drink before this test?
No special preparation is usually needed, but follow your provider’s instructions. Avoid alcohol or certain medications that may affect blood levels if directed.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy