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FSH Test — Basic Information
FSH (Follicle-Stimulating Hormone) is a blood test that measures the amount of FSH in your blood. FSH is produced by the pituitary gland and is important for ovulation, menstrual cycles and fertility in women, and sperm production in men.
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MedlinePlus
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Why is an FSH test done?
In women, doctors may order FSH to evaluate:
Fertility or difficulty becoming pregnant
Irregular or absent periods
Ovarian function
Perimenopause or menopause
Possible premature ovarian insufficiency
In men, it can help evaluate infertility, low sperm count, or problems with testicular function.
M
MedlinePlus
When should women do the FSH test?
If the test is being done for fertility evaluation, timing matters because FSH changes during the menstrual cycle. It is commonly checked around day 2–3 of the menstrual cycle, depending on the doctor's instructions.
C
Cleveland Clinic
Do you need fasting?
Usually, fasting is not required for an FSH blood test. However, follow the specific instructions from your doctor/laboratory, particularly if other blood tests are being done at the same time.
What is a normal FSH level?
Reference ranges vary by laboratory, age, sex, and—in women—menstrual-cycle stage. For example, MedlinePlus lists approximately:
Adult men: 1.5–12.4 mIU/mL
Women who are menstruating: 4.7–21.5 mIU/mL
After menopause: 25.8–134.8 mIU/mL
These are general ranges, not a diagnosis; the reference range printed on your own report is most important.
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MedlinePlus
Important: A high FSH can occur when the ovaries or testes are not responding normally, while low FSH can sometimes indicate problems involving the pituitary or hypothalamus. FSH should generally be interpreted together with other information and sometimes tests such as LH, estradiol, progesterone, AMH, or testosterone.
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MedlinePlus
If you have your FSH result, age, sex, and (if female) menstrual-cycle day, send them to me and I can explain what the number may mean in nidan pathology laboratory @location
