Quick Facts
- Sample: Blood (serum)
- Fasting: No fasting required
- Turn-around: 5-6 business days. May take longer based on weather, holiday, or lab delays.
Benefits
- Monitor pregnancy health - Track fetal and placental development during second trimester
- Early risk detection - Identify potential chromosomal abnormalities before birth
- Convenient testing - No physician referral required for direct lab access
- Fast results - Secure online delivery within 5-6 business days
- No preparation needed - Flexible scheduling with no fasting requirements
- Peace of mind - Reliable hormone monitoring for expectant mothers
Who Is This Test For?
- Pregnant women during second trimester for routine prenatal screening
- Expectant mothers with high-risk pregnancies or family history concerns
- Women over 35 years old during pregnancy
- Those with gestational diabetes requiring additional monitoring
- Mothers seeking proactive pregnancy health assessment
- Anyone undergoing quad or triple marker screening
How It Works – Just 3 Steps
- Order online - Schedule your test at a convenient Walk-In Lab location
- Provide blood sample - Quick, simple blood draw by certified technicians
- Get results - Secure online delivery
FAQ
What does this test measure? The test measures estriol (E3), an estrogen hormone produced by the placenta during pregnancy.
When is the best time to get tested? Typically during the second trimester (15-20 weeks) as part of prenatal screening.
Are the results accurate? Yes, using advanced immunoassay methods with 80% sensitivity for detecting chromosomal abnormalities (ACOG 2020).
What if my levels are abnormal? Consult your healthcare provider for interpretation and potential follow-up testing.
Can men take this test? While possible, estriol levels are extremely low in non-pregnant individuals and rarely clinically relevant.
More Details
What is the purpose of this test?
The Estriol (E3) Blood Test measures unconjugated estriol levels in your blood to assess fetal and placental health during pregnancy. Estriol is primarily produced by the placenta, with levels increasing throughout pregnancy as an indicator of normal fetal development (Mayo Clinic 2019). This test is commonly included in second-trimester screening panels like the quad screen to evaluate risk for chromosomal abnormalities such as Down syndrome.
Who would benefit from this test?
This test is particularly valuable for pregnant women, especially those considered high-risk due to advanced maternal age (over 35), family history of genetic disorders, or existing conditions like gestational diabetes (CDC 2024). Healthcare providers routinely recommend estriol testing as part of comprehensive prenatal care to ensure optimal pregnancy outcomes and early detection of potential complications.
When should I order Estriol (E3) Blood Test?
Order this test during your second trimester, typically between 15-20 weeks of pregnancy, as part of routine prenatal screening (Ulta Lab Tests 2024). Your healthcare provider may recommend additional testing if you have risk factors or if initial results suggest the need for monitoring. Some high-risk pregnancies may require serial testing to track changes over time.
How do I interpret the results?
Estriol Level: Normal range for gestational age
- What it means: Healthy fetal and placental development
- Typical action: Continue routine prenatal care
Estriol Level: Below normal range
- What it means: Possible fetal or placental issues
- Typical action: Additional testing and monitoring
Estriol Level: Above normal range
- What it means: May indicate multiple pregnancies or fetal distress
- Typical action: Further evaluation recommended
Results are always interpreted alongside other screening markers and your specific gestational age for the most accurate assessment.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
Pre-test preparation
No special preparation is required for the Estriol Blood Test. You don't need to fast or avoid any foods or medications beforehand (MedlinePlus 2022). Simply schedule your appointment at a convenient time and follow any specific instructions provided by your healthcare provider or the testing facility.
How often should I get tested?
- Routine prenatal care: Once during second trimester
- High-risk pregnancy: As recommended by healthcare provider
- Abnormal initial results: Follow-up testing per medical guidance
- Multiple pregnancies: More frequent monitoring may be needed
Why early detection matters
Early identification of potential fetal or placental issues through estriol testing allows for timely medical intervention and improved pregnancy outcomes. Chromosomal abnormalities occur in approximately 1 in 700 live births, making routine screening cost-effective and potentially life-saving (CDC 2023). Proactive monitoring enables healthcare providers to develop appropriate management plans and prepare families for any necessary medical care.
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