What Is Am Unconjugated Estriol Test?
Unconjugated Estriol (uE3) is a hormone produced by the placenta and fetal liver during pregnancy. Unconjugated Estriol Tests is one of the components of the triple or quad screen, which is a prenatal screening test performed during the second trimester, typically between 15 and 20 weeks of pregnancy. uE3 test helps assess the risk or certain genetic conditions, such as Down syndrome, Edwards syndrome and neural tube defects.
Unconjugated estriol levels are an important indicator of fetal health. Low levels of uE3 may suggest an increased risk of chromosomal abnormalities or placental insufficiency, while normal levels are associated with a healthy pregnancy. The test is non-invasive and is often recommended for pregnant women, especially those with risk factors such as advanced maternal age, a family history of genetic disorders or abnormal ultrasound findings.
How is the Test Performed?
Sample Collection
The test is a minimally invasive and requires a small blood sample from the expecting mother.
Lab Analysis
Immunoassay techniques are used to measure the concentration of unconjugated estriol in the blood sample.
Turnaround Time
Results are normally available in a few days.
What are the symptoms that prompt this test?
Unconjugated Estriol test is a part of routine prenatal screening and is not prompted by specific symptoms. It is recommended in the following situations:
- Routine Prenatal Screening – To assess the risk of genetic abnormalities.
- Advanced Maternal Age – If expecting mother is over the age of 35 as they tend to have more risk of chromosomal abnormalities.
- Abnormal Ultrasound Findings – If ultrasound tests pick up growth restrictions or structural abnormalities.
- Family History – If there is a family history of genetic disorders or previous pregnancies with chromosomal abnormalities.
What are Normal Ranges for This Test?
Estriol levels vary by stage of pregnancy and individual health conditions. General reference ranges include:
- First trimester: 0.3 to 2.0 ng/mL
- Second trimester: 1.0 to 8.0 ng/mL
- Third trimester: 5.0 to 40.0 ng/mL
** Normal levels are dependent on a number of factors including age, gender, testing method and health condition of patient etc. Result interpretation should be done by a qualified doctor or healthcare professional.**
What Happens if Test Results Show Abnormal Levels?
Abnormal levels of 17 OH Progesterone, particularly elevated levels, can indicate Congenital Adrenal Hyperplasia (CAH) or other adrenal disorders. Typically your healthcare provider might demand further testing to confirm diagnosis and assess the severity of your condition. These tests might include genetic testing, imaging studies of the adrenal glands etc.
If CAH is diagnosed, treatment often involves hormone replacement therapy to correct the imbalance of cortisol and aldosterone.
Ongoing monitoring for individuals diagnosed with CAH or other adrenal gland disorders is necessary to ensure hormonal balance.
