During menopause, ovulation stops. With the end of ovulation, the FSH levels never drops, they are constantly high. The symptoms and the other characteristics of menopause are observed as a result of lack of estrogen. Consequently, the pituitary gland is made to release more FSH in an effort to stimulate the ovaries into producing more estrogen. However, this is a futile attempt, since when a woman reaches menopause, estrogen fails to get ovarian follicles to develop. The FSH level remains high, and this indicates that the woman is approaching menopause or Menopause has began.
To find out how your levels measure up, there are both FDA-approved, at-home tests and laboratory tests that are performed in your doctor's office (at this time, however, at-home FSH testing isn't available for men). The at-home version is similar to an at-home pregnancy test -- on a certain day of her monthly cycle (FSH is typically tested on day 3), a woman urinates on a test stick. Laboratory testing is a simple blood test, also on day 3, and is often done in conjunction with testing the levels of other related hormones, specifically LH, to pinpoint if there's a problem with the amount of hormone the body is producing.