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Estriol (E3) Blood Test

* This is not a home test kit. You will need to visit a local lab for testing.

Also Known As

Pregnancy Estriol, Unconjugated Estriol

The Purpose of an Estriol Test

If you’re pregnant, you’re probably getting blood work done regularly so your doctor can ensure the health of you and your fetus. An estriol blood test will likely be among those lab orders. This hormone is produced by people who are pregnant and is one of three predominant forms of estrogen. (The others are estrone, or E1, and estradiol, or E2.)

Created in the placenta, E3 ensures a healthy environment for your baby by facilitating uterine growth. It’s also vital for the birthing process and breastfeeding. Without enough estriol, your placenta may not function as it should; low levels may also indicate a fetal health condition such as Down syndrome. (To detect potential birth defects, an estriol test is typically performed between weeks 15 and 20 in your pregnancy, usually as part of a broader triple or quad screen test that analyzes multiple markers.)

Estriol, Serum (34883)
Estriol, Serum (004614)

What Does the Estriol Blood Test Measure?

This test shows the level of estriol in your system, so your doctor can ensure it falls within the normal range for your stage of your pregnancy.

Who Should Take an E3 Blood Test?

People may take an estriol lab test as part of a fetal development screening early in the second trimester of pregnancy. If you have a high-risk pregnancy, you may be tested more frequently in the weeks leading up to your due date.

E3 Labs Preparation

There are no special instructions that need to be followed before taking an estriol lab test.

Estriol Blood Test Results

Estriol levels increase as a pregnancy progresses, so the normal ranges depend on your gestational stage. For instance, in the 27th week of your pregnancy, the estriol range is typically 2.6 to 7.1 ng/mL; by week 40, that range goes up to 8.5 to >13.3 ng/mL.

Where Can I Get E3 Labs Near Me?

You can count on Personalabs as your trusted resource for women’s hormone tests, as well as pregnancy and prenatal testing. We know you’re making healthcare decisions for two now (or maybe even more), so we want you to rest assured that you can get the testing and results you need. Our process is designed with your convenience in mind:

Step 1: Order the test you want from our online store. (Note: Check to make sure you don’t need a doctor’s approval to purchase the test in the state where you live.) Download the lab order that comes with the test; you’ll need it for your testing appointment.

Step 2: Schedule your blood draw with the help of our lab locator. This tool helps you find the Labcorp or Quest Diagnostics facility near you from among 4,000-plus sites nationwide.

Step 3: Bring the test order to the lab when it’s time for your blood draw.

Step 4: Check your private and secure Personalabs portal for the results report. It usually arrives within 2 to 10 business days of your test, but if you need results as soon as possible, contact us, and we will partner with the lab to meet your deadline.

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Additional information


LabCorp, Quest

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Get Your Results

Results can be provided in as little as 24-48 hrs. For more complex tests, please contact us for turn around times.


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