What is an estrogen test?An estrogen test measures the level of estrogens in the blood or urine. Estrogen can also be measured in saliva using at-home test kit. Estrogens are a group of hormones that play a key role in the development of female physical features and reproductive functions, including the growth of breasts and the uterus, and regulation of the menstrual cycle. Men also make estrogen but in much smaller amounts.There are many types of estrogens, but only three types are commonly tested:Estrone, also called E1, is the main female hormone made by women after menopause. Menopause is a time in a woman's life when her menstrual periods have stopped and she can't become pregnant anymore. It usually starts when a woman is around 50 years old.Estradiol, also called E2, is the main female hormone made by nonpregnant women.Estriol, also called E3 is a hormone that increases during pregnancy.Measuring estrogen levels can provide important information about your fertility (the ability to get pregnant), the health of your pregnancy, your menstrual cycle, and other health conditions.Other names: estradiol test, estrone (E1), estradiol (E2), estriol (E3), estrogenic hormone test
