Estradiol is a type of estrogen, a hormone that plays a key role in the female reproductive system. A estradiol blood test measures the level of estradiol in the blood. This test is often ordered to help diagnose and treat conditions related to abnormal estrogen levels in the body, such as polycystic ovary syndrome (PCOS) and menstrual disorders. It can also be used to monitor hormone therapy in people with conditions such as menopause or breast cancer. The estradiol blood test is usually performed on a sample of blood taken from a vein in the arm.
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