Estrogen, or oestrogen, is the primary female sex hormone. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens in females that have estrogenic hormonal activity: estrone, estradiol, and estriol. The estrane steroid estradiol is the most potent and prevalent of these.
A blood test to measure or monitor estrogen levels is to detect an abnormal level or hormone imbalance in the case of signs and symptoms. It also could be to monitor treatment for infertility or symptoms of menopause; sometimes to test for fetal-placental status during early stages of pregnancy.
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