A follicle-stimulating hormone (FSH) blood test measures the levels of FSH in a person's blood. FSH is a hormone produced by the pituitary gland, and it plays a role in regulating the menstrual cycle and the production of eggs in women and sperm in men. In women, elevated levels of FSH can be a sign of menopause or other reproductive problems, while in men, low levels of FSH can be a sign of testicular failure or other problems with sperm production. A blood sample is required to perform ths test.
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