Unconjugated Estriol (uE3) Test
About Unconjugated Estriol (uE3) Test
| Field | Value |
|---|---|
| Also Known As | uE3, Free Estriol, Maternal Serum Unconjugated Estriol, Serum uE3, E3 Unconjugated |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting required |
| Report Time | Within 24 to 48 hours |
| Recommended For | Pregnant women, typically between 15 and 20 weeks of gestation |
| Price | Starting at ₹1,100 |
What Is an Unconjugated Estriol (uE3) Test?
The unconjugated estriol test measures the level of a specific form of oestrogen in a pregnant woman's blood. This oestrogen, known as unconjugated oestriol, is produced jointly by the foetus and the placenta during pregnancy.
Also called the free estriol test or serum uE3 test, it is not a standalone test but one component of the second-trimester maternal serum screening panel, which includes the triple screen and quadruple screen. A small blood sample drawn from a vein in the arm is all that is needed.
What Does an Unconjugated Estriol (uE3) Test Measure?
The uE3 test measures a single marker: unconjugated oestriol circulating in the mother's blood. Understanding how this marker is produced helps explain why it is useful.
The table below summarises what this test measures and why it matters.
| Parameter | What It Reflects |
|---|---|
| Unconjugated Estriol (uE3) | Oestrogen produced by the foetal adrenal glands and liver, then converted in the placenta; levels reflect combined foetal and placental function |
In a healthy pregnancy, the foetal adrenal glands produce a hormone precursor that travels to the placenta, where it is converted into oestriol. A portion of this crosses into the mother's bloodstream in its unconjugated (unmodified) form. Because the mother's liver processes it very quickly, its presence in maternal blood directly reflects how well the foetus and placenta are functioning together.
Results are typically expressed as Multiples of the Median (MoM), which compares a patient's value against the expected median for that gestational age.
Why Is an Unconjugated Estriol (uE3) Test Done?
The maternal serum unconjugated estriol test is a routine part of second-trimester prenatal care. It is offered to pregnant women as a screening tool, not because of any specific symptom.
Common Symptoms That May Require This Test
This test is not triggered by specific maternal symptoms. It is offered routinely to all pregnant women in the second trimester. The following are the typical clinical indications for ordering it:
- Routine second-trimester prenatal screening (standard of care)
- Advanced maternal age, which increases the risk of chromosomal conditions
- A family history of chromosomal abnormalities or genetic disorders
- Abnormal findings on a first-trimester screen
- A previous pregnancy affected by a chromosomal condition
- An ultrasound finding that requires further evaluation
Conditions This Test Can Help Detect
The uE3 blood test is evaluated alongside other markers to assess the risk of several foetal conditions. It can help identify an increased likelihood of:
- Down syndrome (Trisomy 21), where uE3 levels tend to be lower than expected
- Edwards syndrome (Trisomy 18), also associated with low uE3 levels
- Smith-Lemli-Opitz syndrome, a disorder affecting foetal steroid metabolism
- Placental steroid sulphatase deficiency, a metabolic condition linked to X-linked ichthyosis (a skin condition)
- Aromatase deficiency and congenital adrenal hyperplasia, which affect hormone production
- Placental insufficiency and foetal growth restriction
- Foetal demise in rare cases
Unconjugated Estriol (uE3) Test During Pregnancy
The unconjugated estriol test is specifically designed for use during pregnancy, making it one of the few tests ordered exclusively for expectant mothers. This test is a core component of the second-trimester maternal serum screening panel, a combined panel which assesses the risk of chromosomal abnormalities such as Down syndrome and neural tube defects like spina bifida. It is typically performed between 15 and 20 weeks of gestation, when its predictive value is greatest.
How to Prepare and What to Expect
Preparation for this test is straightforward. No special steps are needed before your appointment.
Do You Need to Fast?
No fasting is required before the uE3 test. You can eat and drink normally on the day of your test. If your doctor has ordered additional tests alongside this one, check whether any of those require fasting.
Practical Tips Before Your Test
A few simple steps will help ensure your sample is collected smoothly and results are accurate:
- Inform your doctor about all medications and supplements you are currently taking, as some can affect results
- Ensure your gestational age has been confirmed by an ultrasound scan before the test, as accurate dating is essential for correct interpretation
- Let your doctor know if you are carrying more than one baby, as multiple pregnancies affect marker levels
- Stay well hydrated before your appointment
- Wear clothing with sleeves that can be rolled up easily for a comfortable blood draw
Step-by-Step Procedure
The sample collection for a free estriol test is a simple blood draw. Here is what to expect:
- A trained phlebotomist will seat you comfortably and ask you to extend one arm
- The skin over a vein, usually on the inside of the elbow, is cleaned with an antiseptic wipe
- A small needle is inserted briefly into the vein to draw a blood sample into a collection vial
- The needle is removed, and a small piece of cotton or a plaster is placed over the site
- The vial is labelled with your details and sent to the laboratory
- Your sample is processed using specialised equipment, and results are dispatched within 24 to 48 hours
Factors That Can Affect Accuracy
Several factors can influence your estriol (unconjugated) test results. Your doctor will take these into account when reviewing your report:
- Inaccurate gestational age dating (the most significant factor)
- Maternal corticosteroid therapy, which can cause lower uE3 readings by suppressing foetal adrenal activity
- Multiple pregnancies, which produce higher uE3 levels than single pregnancies
- Antiseizure medications, which may affect levels of multiple markers including uE3
- Maternal weight, age, race, and diabetic status, all of which are factored into risk calculations
- Rare antibody interference in the laboratory assay
Understanding Your Unconjugated Estriol (uE3) Test Results
Your doctor will review your uE3 test result alongside the other markers in your screening panel and in the context of your full medical history. A single value is never interpreted in isolation.
The table below shows how uE3 levels change throughout a normal pregnancy.
| Gestational Age | Typical uE3 Level | Unit |
|---|---|---|
| 15 weeks | 0.26 to 0.86 | ng/mL |
| 20 weeks | 1.1 to 2.4 | ng/mL |
| 30 to 32 weeks | 2.4 to 11.4 | ng/mL |
| 33 to 36 weeks | 3.0 to >12 | ng/mL |
| 37 to 40 weeks (term) | 5.6 to >12, rising towards term | ng/mL |
| Non-pregnant women or men | Very low or undetectable | ng/mL |
Disclaimer: These ranges are general guidelines. As testing equipment varies by laboratory and your individual factors (like weight and ethnicity) shift these numbers, doctors do not rely on raw numbers alone. Instead, your lab report will convert these figures into a standardised format called Multiples of the Median (MoM) to calculate your final, accurate screening score. Always consult your doctor for personalised medical interpretation.
Results During Special Conditions
Certain circumstances can affect how your result should be read: Maternal corticosteroid therapy can lower uE3 levels by suppressing foetal adrenal function, which may lead to a reading that appears abnormal without reflecting a true foetal condition. If you are carrying twins or triplets, uE3 levels are naturally higher than in a single pregnancy, and reference ranges are adjusted accordingly. Antiseizure medications taken during pregnancy may also alter levels of uE3 and other screening markers, so accurate medication disclosure is important.
How to Maintain Healthy Levels
While uE3 is not a lifestyle marker, general pregnancy wellbeing supports healthy foetal and placental function:
- Attend all scheduled prenatal appointments and do not miss recommended screening windows
- Follow a balanced diet with adequate nutrients, particularly folate, iron, and calcium
- Always discuss any new or existing medications with your doctor before continuing or stopping them during pregnancy
Lupin Diagnostics Unconjugated Estriol (uE3) Test Price and Home Collection
The unconjugated estriol test price at Lupin Diagnostics starts at ₹1,100, and home collection is available for your convenience.
| City / Source | Approximate Price (₹) |
|---|---|
| Mumbai | ₹1,100 |
| Bhopal | ₹1,100 |
| Hyderabad | ₹1,100 |
| Pune | ₹1,100 |
| Indore | ₹1,100 |
| Chennai | ₹1,100 |
| Kolkata | ₹1,100 |
| Bangalore | ₹1,100 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
If you are searching for a 'uE3 test near me', booking through Lupin Diagnostics is simple:
- Select the test on the Lupin Diagnostics website
- Choose your city and preferred time slot
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre
- Receive your report via email or WhatsApp within the stipulated turnaround time
Home Collection
Lupin Diagnostics offers home sample collection for the maternal serum unconjugated estriol test across cities, making it particularly convenient for pregnant women. All samples are processed in NABL-accredited laboratories by experienced technologists. Digital reports are accessible via email or WhatsApp as soon as they are ready.
Frequently Asked Questions
The unconjugated estriol test is used as part of second-trimester maternal serum screening. It is one of three or four markers measured together to assess the risk of chromosomal conditions such as Down syndrome and Edwards syndrome in the foetus. It does not diagnose these conditions on its own.
The free estriol test is ideally done between 15 and 20 weeks of gestation. It can be performed between 14 and 22 weeks, but the 15 to 20 week window gives the most reliable results. Your doctor will advise the best timing based on your pregnancy dates.
No. An abnormal screening result does not confirm a diagnosis. Results can appear abnormal if gestational age has been estimated incorrectly or if other individual factors are involved. Your doctor may recommend further diagnostic testing, such as amniocentesis, to investigate further.
Very low or undetectable levels may indicate conditions such as steroid sulphatase deficiency, Smith-Lemli-Opitz syndrome, or foetal adrenal insufficiency. Your doctor will review the result alongside other markers and may refer you for genetic counselling or additional testing.
Yes, certain medications can affect your result. Corticosteroids can lower uE3 levels by suppressing foetal adrenal activity, and antiseizure medications may also influence multiple screening markers. Always give your doctor a full list of any medications or supplements you are taking before the serum uE3 test.
Both include uE3 as one of the markers. The triple screen measures three markers: AFP, hCG, and uE3. The quadruple screen adds a fourth marker, inhibin A, which improves the detection rate for Down syndrome from around 69% to approximately 81%. Your doctor will advise on which panel is appropriate for you.
Yes. Lupin Diagnostics offers home collection for the uE3 blood test across multiple cities in India. A certified phlebotomist visits your home at a time you choose, collects the blood sample, and your digital report is delivered within 24 to 48 hours.
Unconjugated Estriol (uE3) Test
