Does this test have other names?
What is this test?
This test measures the amount of estradiol (E2), the form of estrogen made mainly
by the ovaries.
E2 plays a key role in the female reproduction system. It's necessary for the development
of the uterus, fallopian tubes, vagina, and breasts. Women have higher amounts of
E2 during their reproductive years and almost none after menopause.
Other estrogens include estrone and estriol. Estrone is the main estrogen made during
In men, E2 is secreted in moderate amounts by the testes throughout life.
Why do I need this test?
You may need this test if your healthcare provider thinks you have a problem caused
by high or low levels of E2. These problems include:
You may also have this test if you have assisted reproductive technology (ART) for
infertility. Or you may have the test if your healthcare provider is monitoring your
hormones during ART.
In adolescents, this test may be done for early puberty.
What other tests might I have along with this test?
Your healthcare provider may also order other tests, depending on what he or she suspects.
These tests may include:
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH), for menopausal problems
FSH, thyroid-stimulating hormone/free thyroxine (TSH/FT4), and prolactin, a hormone
needed for breastmilk production, if your periods have stopped
FSH and LH, for early puberty
TSH, prolactin, FSH, and LH, for both male and female infertility issues
What do my test results mean?
Many things may affect your lab test results. These include the method each lab uses
to do the test. Even if your test results are different from the normal value, you
may not have a problem. To learn what the results mean for you, talk with your healthcare
Results are given in picograms per milliliter (pg/mL). Normal levels for estradiol
If your results are lower, it may mean you have ovarian failure, also called early
menopause, or low estrogen from rapid weight loss or anorexia.
If your results are higher, it may mean you have tumors of the ovary, testes, or adrenal
How is this test done?
The test requires a blood sample, which is drawn through a needle from a vein in your
Does this test pose any risks?
Taking a blood sample with a needle carries risks that include bleeding, infection,
bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight
stinging sensation or pain. Afterward, the site may be slightly sore.
What might affect my test results?
Taking birth control pills or hormone therapy may affect your results.
How do I get ready for this test?
You don't need to prepare for this test. But be sure your healthcare provider knows
about all medicines, herbs, vitamins, and supplements you are taking. This includes
medicines that don't need a prescription and any illicit drugs you may use.