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Estrogen is the primary female sex hormone as well as a medication. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens in women and men: estrone, estradiol, and estriol. This test does not specify each of these estrogens.
The CA 125 level can help doctors understand how to manage patients with ovarian cancer. However, the CA 125 blood test is not advised for women who are at average risk for ovarian cancer. Women with ovarian cancer usually have high levels of CA 125. However, a high CA 125 level does not always mean you have ovarian cancer. Some women who have ovarian cancer may never show a high CA 125 level.
Estrone (E1) is one of the three estrogens, which also include estriol and estradiol. Estrone is the least abundant of the three and is considered a pro-hormone of estradiol.
