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Unconjugated Estriol (uE3)

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Unconjugated Estriol (uE3) Test Details

What is the Unconjugated Estriol (uE3) Test?

The Unconjugated Estriol (uE3) test measures the level of estriol, a type of estrogen, in a pregnant woman’s blood. Estriol is produced by the placenta and fetal liver and plays a crucial role in monitoring fetal health.

Why is the Test Done?

  • Part of Prenatal Screening: The uE3 test is commonly included in the Triple Screen or Quad Screen, which helps assess the risk of fetal chromosomal abnormalities such as:
    • Down syndrome (Trisomy 21)
    • Edwards syndrome (Trisomy 18)
    • Neural tube defects (if combined with other markers)
  • Monitoring Fetal Health: Low estriol levels may indicate placental insufficiency or fetal distress.
  • Assessing Maternal Hormonal Balance: Rarely, it may be used in non-pregnant women for hormonal evaluation.

Normal Estriol Levels in Pregnancy

Estriol levels gradually rise during pregnancy. The normal range varies depending on gestational age, but approximate values are:

Gestational Age (Weeks) Estriol Level (ng/mL)
15 – 18 weeks 0.3 – 4.5
19 – 24 weeks 1.0 – 6.0
25 – 28 weeks 2.5 – 10.5
29 – 32 weeks 4.0 – 16.0
33 – 36 weeks 5.0 – 25.0
37 – 40 weeks 8.0 – 30.0

(Values may vary by lab and testing method.)

Interpreting Results

  • Low uE3 levels:

    • Possible Down syndrome (Trisomy 21)
    • Possible Edwards syndrome (Trisomy 18)
    • Fetal growth restriction or placental insufficiency
    • Adrenal insufficiency (in rare cases)

  • High uE3 levels:

    • Generally not a concern but can be associated with multiple pregnancies (twins, triplets).
    • Sometimes linked to maternal liver diseases.

Test Procedure

  • Sample Type: Blood sample (serum)
  • Fasting Requirement: Not required
  • Test Timing: Usually performed between 15 to 20 weeks of pregnancy as part of the prenatal screening.

Follow-Up After an Abnormal Result

If the uE3 level is abnormal, additional tests may be recommended:

  • Ultrasound scan (to check fetal growth and development)
  • Amniocentesis (for chromosomal analysis)
  • Non-invasive prenatal testing (NIPT) (to assess genetic risk)