Estradiol Test
An estradiol test measures estradiol, the most active form of estrogen in the body. Clinicians often use it to help evaluate reproductive and hormonal health in people of any sex.
About this test
Estradiol is a form of estrogen, a group of hormones involved in reproduction, bone health, and many other body systems. In people assigned female at birth, most estradiol is produced by the ovaries, while smaller amounts come from other tissues; in people assigned male at birth, it is made in smaller quantities from other hormones.
The estradiol test is performed with a routine blood draw at a patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and sends it to the laboratory.
Who might consider this test?
- Often exploring questions about menstrual cycles
- Symptoms that can be linked to shifting hormone activity
- Such as changes in energy
Test details
| Quest code | 4021 |
|---|---|
| Methodology | Immunoassay (IA) |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
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Additional details
What estradiol reflects
Estradiol is one of several estrogens the body makes, and it is generally the most potent of them. It plays a role in the menstrual cycle, in the development and maintenance of reproductive tissues, and in areas such as bone strength that reach well beyond reproduction. Measuring it gives a clinician a window into estrogen activity at the time the sample was taken.
It helps to remember that a single estradiol measurement is a snapshot. Levels shift naturally across the day, across the menstrual cycle, and across the different stages of life, so a clinician reads a result in the context of when it was drawn rather than as a fixed number.
How it fits with other hormone tests
Estradiol is often considered alongside other markers rather than on its own. Depending on what a clinician is exploring, it may be paired with pituitary hormones such as FSH and LH, which help describe the signals reaching the ovaries, or with other estrogens when a fuller estrogen picture is wanted. Read together, these markers offer more context than estradiol alone can provide.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does an estradiol test measure?
It measures estradiol, the most active form of estrogen, in the blood. Estradiol is involved in reproduction, bone health, and other body systems, and clinicians use it to help evaluate hormonal health.
Is estradiol only relevant to women?
No. Estradiol is present in people of any sex, though the amounts and sources differ. Clinicians may consider it in a range of situations regardless of sex.
Does the timing of the test matter?
It can. Estradiol rises and falls across the menstrual cycle and changes with life stage, so a clinician often takes the timing of the draw into account when reviewing a result.
How is the sample collected?
Through a routine blood draw at a patient service center. A phlebotomist takes a small sample from a vein in the arm and sends it to the laboratory.
Is estradiol ever measured with other hormones?
Yes. Clinicians often pair estradiol with markers such as FSH and LH, or with other estrogens, to build a fuller picture of hormonal activity.
How much does the Estradiol test cost?
The cash price at Celio Health is $39. That covers the physician's order and sample collection at a Quest patient service center — no insurance is needed and there's no separate doctor's visit to pay for.