Follicle-stimulating hormone (FSH) measurement in serum/plasma

What Is Follicle-Stimulating Hormone (FSH)?

FSH, or follicle-stimulating hormone, is a critical hormone involved in reproductive processes. In women, it stimulates the growth of follicles in the ovaries, which eventually release eggs. In men, FSH supports sperm production in the testes. Your body produces FSH in the pituitary gland, a small organ at the base of the brain.

Why Might You Need This Test?

Doctors may order an FSH test to evaluate fertility issues, hormone imbalances, or conditions affecting reproductive health. It can help diagnose problems like polycystic ovary syndrome (PCOS), ovarian dysfunction, or low sperm production. FSH levels can also be checked during fertility treatments or to monitor conditions like early menopause or hypogonadism.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. You may feel a slight pinch when the needle is inserted, but the procedure is quick and usually painless. The blood is then sent to a lab for analysis. No special preparation is usually needed, but your doctor may advise fasting or avoiding certain activities before the test.

What Do FSH Levels Tell Us?

FSH levels can indicate whether your reproductive system is functioning normally. High or low levels may suggest underlying health issues, such as hormonal imbalances, genetic conditions, or damage to reproductive organs. While reference ranges vary by age and gender, your doctor will interpret results in the context of your medical history and symptoms.