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Follicle-stimulating hormone (FSH) is a hormone associated with reproduction and the development of eggs in women and sperm in men. FSH is made by the pituitary gland, a grape-sized organ located at the base of the brain.
Control of FSH production is a complex system involving the hypothalamus in the brain, the pituitary gland, and the hormones produced by the ovaries or testicles.
This may be caused by: Normal FSH and LH levels with a few signs of puberty can also be a benign form of precocious puberty with no underlying or discernable cause or may just be a normal variation of puberty.
In delayed puberty, LH and FSH levels can be normal or below what is expected for a youth within this age range.
No test preparation is needed, but a woman's sample should be collected at specific times during her menstrual cycle.
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The content on the site, which has been reviewed by laboratory scientists and other medical professionals, provides general explanations of what results might mean for each test listed on the site, such as what a high or low value might suggest to your healthcare practitioner about your health or medical condition.
Low levels of FSH and LH are consistent with secondary ovarian failure due to a pituitary disorder or hypothalamic problem.
Low FSH serum levels have been associated with increased risk of ovarian cancer.