Your doctor will ask you if you’ve had changes typical of menopause, like hot flashes, irregular periods, sleep problems, and vaginal dryness. Normally, menopause is confirmed when a woman hasn’t had her period for 12 months in a row.
However, with certain types of premature menopause, these signs may not be enough for a diagnosis. A blood test that measures follicle-stimulating hormone (FSH) can be done. Your ovaries use this hormone to make estrogen. FSH levels rise when the ovaries stop making estrogen. When FSH levels are higher than normal, you’ve reached menopause. However, your estrogen levels vary daily, so you may need this test more than once to know for sure.
You may also have a test for levels of estradiol (a type of estrogen) and luteinizing hormone (LH). Estradiol levels fall when the ovaries fail. Levels lower than normal are a sign of menopause. LH is a hormone that triggers ovulation. If you test above normal levels, you’ve gone through menopause.
Source: U.S. Department of Health and Human Services.