estradiol
Reproductive EndocrinologyBlood sampleResults 2-3 daysNo fasting
Estradiol
Estradiol (E2) is the main form of estrogen. This test measures its level in your blood.
Sample
Blood
Results
2-3 days
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Estradiol (E2)
ECLIA · serum
Quantitative · pg/mL
When to get this test
Menstrual irregularity
Helps evaluate irregular or absent periods and related hormone concerns.
Fertility work-up
Used alongside FSH and LH to assess ovarian function and cycle stage.
Menopause assessment
Supports evaluation of symptoms that may be related to changing estrogen levels.
How to prepare
01
Your provider may ask for sampling on a specific day of your menstrual cycle.
Common questions
Why does the day of my cycle matter?
Estradiol levels rise and fall during the menstrual cycle. Sampling on the day your provider requests helps the result be interpreted correctly.
What does estradiol indicate?
It reflects estrogen activity, mainly from the ovaries, and helps assess fertility, menstrual, and menopausal concerns.