Test library
Estradiol Blood Test
An estradiol test measures the level of estradiol, the main form of estrogen, in the blood. It is used to evaluate reproductive and hormonal health in women and men.
Order Estradiol Blood Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Estradiol Blood Test- Typical turnaround
- 1-3 business days
- Starting price
- From $198
- Results
- Confidential, online
Quick answer
An estradiol test measures the amount of estradiol in the blood. Estradiol is the most active form of estrogen and plays a central role in the menstrual cycle, reproductive health, and bone health, and it is present in smaller amounts in men. The test is often part of a hormone evaluation, and results are interpreted by a qualified healthcare provider.
What this test measures
Estradiol is produced mainly by the ovaries and, in smaller amounts, by the testes and adrenal glands. Levels change through the menstrual cycle, decline after menopause, and follow a daily rhythm. Because of these natural shifts, a single measurement is interpreted with attention to timing, age, and sex.
The test uses a serum sample collected from a vein. It is often ordered together with follicle-stimulating hormone and luteinizing hormone to give a fuller picture of reproductive hormone signaling, and additional markers such as progesterone or prolactin may be included depending on the question.
People may order this test when evaluating irregular periods, fertility concerns, menopause-related symptoms, or hormone balance in men. It can also be used to follow levels during certain hormone therapies. A qualified healthcare provider should interpret the result with your symptoms, history, and any other hormone tests.
- Estradiol
- Follicle-stimulating hormone (FSH)
- Luteinizing hormone (LH)
- Progesterone (when included)
- Prolactin (when included)
- Total testosterone (when included)
- Sex hormone-binding globulin (when included)
Why people order this test
- Evaluate irregular menstrual cycles
- Support fertility assessment
- Review menopause-related symptoms
- Assess hormone balance in men
- Monitor hormone therapy with a provider
- Part of a broader hormone panel
How to prepare
Timing may matter: in menstruating women a provider may specify the cycle day, and morning collection is often suggested for men. Fasting is not usually required. A blood sample is collected from a vein. Follow the instructions provided with your order.
Understanding your results
Results are generally available within 1-3 business days. Reference ranges vary by sex, age, and cycle timing. A qualified healthcare provider should interpret the value with your symptoms, history, and any related hormone tests.
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Frequently Asked Questions
What is estradiol?
Estradiol is the most active form of estrogen. It is involved in the menstrual cycle, reproductive health, and bone health, and it is present in smaller amounts in men.
Why does timing matter for this test?
Estradiol levels change through the menstrual cycle and during the day, so a provider may specify when the sample should be collected.
How does estradiol relate to total estrogen?
Estradiol is one of several estrogens. A total estrogen test measures the combined level, while this test focuses on estradiol alone.
Do I need to fast?
Fasting is not usually required unless other components of the panel call for it.
Can this test diagnose infertility?
No. It provides one piece of information within a broader evaluation that a qualified healthcare provider interprets.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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