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Test Overview. An estrogen test measures the level of the most important estrogen hormones in a blood or urine sample. It measures estradiol, estriol, and estrone. Estradiol is the most common type of estrogen measured for nonpregnant women. The amount of estradiol in a woman's blood varies throughout her menstrual cycle.
A blood test to check estradiol levels is one of the most common fertility tests. One reason to have your estradiol levels checked is to determine your ovariesâ ability to produce eggs (which is known as ovarian reserve). It can also help to determine if your follicle stimulating hormone (FSH) test was accurate or not.t could also mean that the estradiol is suppressing FSH. Either of these things could mean that you will have more trouble getting pregnant, more trouble ovulating (even with treatment) and reduced success with IVF. In rare cases, high levels of estradiol could indicate an ovarian tumor or hyperthyroidism.