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Hormone Tests

FSH (Follicle Stimulating Hormone)

FSH (follicle stimulating hormone) is made by the pituitary gland. It drives egg development in women and sperm production in men.

Normal range (adults)
Men 1.5–12.4 mIU/mL (1.5–12.4 IU/L) · Women 3.5–12.5 mIU/mL (3.5–12.5 IU/L)
Sample
Blood
Fasting
Not usually needed
Also called
Follicle Stimulating Hormone, Follicle-Stimulating Hormone, F.S.H

FSH normal range

Group mIU/mLConventional units: US, South Asia IU/LSI units: UK, Europe, Australia, international
Men1.5–12.41.5–12.4
Women3.5–12.53.5–12.5

In women, FSH varies with the cycle phase and rises sharply after menopause.

Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.

Why is the FSH test done?

It is checked for fertility problems, irregular or absent periods, and to confirm menopause.

What does a high FSH level mean?

High FSH means the ovaries or testes are not responding well, so the brain is pushing harder. It is normal after menopause.

Common causes

  • Menopause or perimenopause
  • Reduced ovarian reserve
  • Testicular failure
  • Turner syndrome or Klinefelter syndrome (rare)
  • After chemotherapy

Diet and lifestyle tips

  • Keep a balanced diet with calcium and vitamin D for bone health after menopause

What does a low FSH level mean?

Low FSH suggests reduced signalling from the brain.

Common causes

  • Pituitary or hypothalamus problems
  • Very low body weight or excessive exercise
  • High prolactin
  • Hormonal contraceptives
  • Pregnancy

Diet and lifestyle tips

  • Eat enough calories if underweight or very active

When should you see a doctor?

FSH varies with the menstrual cycle; your doctor will tell you which day to test (usually day 2 to 5).

Last updated

This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.