FSH blood test
Explanation
Follicle-stimulating hormone (FSH) is a chemical messenger made by the pituitary gland at the base of the brain. It helps eggs develop in the ovaries and supports sperm production in the testicles. A blood test measures its level.
Why might FSH be tested?
The test can help investigate irregular or missing periods, difficulty becoming pregnant, a low sperm count, or puberty starting unusually early or late. It is often measured with other hormones.
What does a high or low result mean?
High FSH can occur when the ovaries or testicles respond less well to hormone signals. It also rises naturally around menopause. Low FSH can reflect reduced signals from the brain. These are possible patterns, not diagnoses from one number.
Age, symptoms and other hormone results affect the interpretation. FSH also changes during the menstrual cycle, so the day of sampling matters. Ask whether your result was taken at the intended time and which other results explain the pattern.
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