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Estradiol details

What Estradiol shows

Estradiol (E2) is the main and most biologically potent form of estrogen, produced primarily by the ovaries in women of reproductive age (with smaller amounts made elsewhere, including in men). It plays a central role in the menstrual cycle, fertility, bone health, and many other body systems, and levels change predictably across the menstrual cycle, pregnancy, and the transition to menopause, where they decline significantly. It's used to evaluate menstrual irregularities, fertility issues, monitor ovarian response during fertility treatments, assess menopausal status, and, in men, evaluate certain hormone imbalances or symptoms like gynecomastia.

Higher estradiol can point to hormone therapy or excess estrogen

Seen around ovulation, in pregnancy and with hormone therapy. In men, can come with breast tenderness or swelling.

Lower estradiol can point to menopause or low ovarian function

Often seen with hot flashes, missed periods, vaginal dryness or low mood.

Who might consider it:

  • Irregular or missed periods, or symptoms of menopause
  • Planning a pregnancy or fertility treatment
  • Using estrogen or testosterone therapy and checking your dose
  • Men with breast tenderness or low sex drive

What can affect your result

Cycle day

Estradiol changes through the menstrual cycle, so the same level means different things on different days.

Hormone therapy and birth control

Estrogen, testosterone and birth control change estradiol.

Biotin supplements

High doses can skew this test. Pause biotin before your draw as your lab or provider advises.

Preparation

  • Fasting is not needed.
  • If you have periods, test on the cycle day your provider asks for, often day 2โ€“5 for fertility testing.
  • If you use hormone therapy or birth control, tell your provider and test at the time they advise.
  • Pause biotin supplements before your draw as your lab or provider advises.

Tests that include Estradiol

Labcorp Not offered
Quest Not offered
Quest Not offered
Quest Not offered
Quest Not offered
Quest Not offered
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