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Estradiol test

Also called: E2, Estrogen test

An estradiol test measures the main form of estrogen. It helps check ovarian function and fertility treatment.

SampleA small tube of blood from a vein in your arm
Fasting?Usually not needed
ResultsUsually within 1 to 2 days
Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.

What the test is

Levels change through the menstrual cycle.

Why it's done

  • Fertility testing and treatment
  • Irregular or missed periods
  • Early or late puberty

Getting ready and what happens

  • Test on the cycle day your provider recommends.

How the test is done

  • A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.

What the results mean

Results

Interpreted with cycle day, FSH, and LH. Low levels after menopause are expected.

Questions to ask your provider

  • What do my results mean for me?
  • Do I need to repeat this test or have other tests?

Risks

A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.

Related conditions

Related medicines

Related tests

Sources

Last updated 2026-11-13.