Estriol (E3) Blood Test
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Test Code: 004614
Specimen Type: Blood
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Description:
Estriol (E3) Blood Test
This test measures the level of Estriol in the blood. Estriol (E3) is one of the 3 main components of Estrogen along with Estradiol and Estrone. During pregnancy, estriol is produced by the placenta. Concentrations of estriol typically begin to rise around the 8th week of pregnancy and continue to increase as the pregnancy progresses. At about 4 weeks prior to the onset of labor, most women will experience a spike in estriol levels. Measuring estriol levels can help assess how well the pregnancy is developing. Abnormal estriol levels may indicate a problem with the pregnancy including the potential development of birth defects. A single estriol measurement is usually not very informative. Repeat testing to monitor how estriol levels are changing is typically more useful.
Serial estriol testing is sometimes ordered starting during the 2nd or 3rd trimester of pregnancy, especially in the case of high-risk pregnancy or for someone with a family history of difficult pregnancies. Results for this test should be evaluated by a person's doctor.
For additional testing options, please see our Prenatal Testing Category.
Turnaround for this test is typically 2-5 business days.
Where can I find a Estriol (E3) Blood Test near me?
Check our lab finder to locate a collection site in your area.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
Requirements:
Repeat testing for estriol monitoring should be drawn around the same time each day.
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