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Inhibin A (Serum or Plasma)

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

This test measures the amount of inhibin A, a protein produced by the ovaries and testes, which helps regulate reproductive hormones.

Quick summary

["Helps assess ovarian or testicular function and fertility potential."]

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

Key facts at a glance

LOINC
23883-2
Short code
Inhibin A SerPl-mCnc
Synonyms
Inhibin A SerPl-mCnc
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 used in fertility evaluations. Doctors may order it to check ovarian reserve in women or testicular function in men. It can also help monitor conditions like polycystic ovary syndrome (PCOS) or other hormonal imbalances.

Why Might You Need This Test?

You might need an inhibin A test if you’re undergoing fertility treatments, experiencing irregular menstrual cycles, or if your doctor suspects an endocrine disorder. It’s also sometimes used in preconception planning or during ovarian aging assessments.

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 for inhibin A levels using an immunoassay method, which detects the protein in your serum or plasma.

What Do Results Mean?

Results are interpreted by your healthcare provider based on your age, sex, and clinical context. Higher levels may indicate normal ovarian function, while lower levels could signal reduced ovarian reserve or other reproductive health concerns.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Inhibin A’s Role in Fertility and Hormonal Balance

Short name

Inhibin A Level

Frequently asked questions

How often will I need this test?
The frequency depends on your medical needs. Some women get it annually during fertility evaluations, while others may need it only during specific stages of treatment or monitoring.
What are the typical reference ranges?
Reference ranges vary by lab and individual factors. Your doctor will provide your specific results and compare them to what’s appropriate for your situation.
Can I eat or drink before this test?
No special preparation is usually needed, but follow your doctor’s instructions. Avoid alcohol for 24 hours before testing, as it may affect results.
  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