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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.
Estrogen and progesterone hormone receptor (ER and PR) status tests are standard tests for all invasive breast cancers, and on recurring cancers, as recommended by guidelines published in 2010 by the American Society of Clinical Oncology (ASCO) and the College of American Pathologists (CAP).