- Estrone (E1)
- Estradiol (Estradiol-17 beta, E2)
- and Estriol (E3)
- Estriol Excretion
Estrone (E1) is a hormone produced by the ovaries, and is the main form of estrogen found in the blood after menopause. Estradiol (E2) is a hormone produced by the ovaries, and levels vary over the course of the menstrual cycle. Levels are usually measured to evaluate early puberty, fertility problems, menstrual problems, menopause, gynecomastia (enlarged breasts in males) or the presence of female sex characteristics, and as a tumor marker for ovarian, testicular, or adrenal gland cancers. Estriol (E3) a form of estrogen produced by the placenta, is only found in the blood during pregnancy. Levels of this hormone are used to monitor the health of the unborn baby during high-risk pregnancies. There can be either false negatives or positives of this test, since levels are also affected by the health of the mother.
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