Extractable Nuclear Antigen (ENA) Profile Test
About Extractable Nuclear Antigen (ENA) Profile Test
| Field | Value |
|---|---|
| Also Known As | ENA Panel, Anti-ENA Test, ENA Antibody Panel |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting needed |
| Report Time | Within 2 days |
| Recommended For | All genders and ages; typically ordered after a positive ANA test |
| Price | Starting at ₹7800 |
What Is an Extractable Nuclear Antigen (ENA) Profile Test?
The extractable nuclear antigen (ENA) profile test is a blood test that detects specific antibodies produced by the immune system against proteins found in the cell nucleus. These antibodies, known as autoantibodies, mistakenly target the body's own cells. Doctors typically order this test after a positive antinuclear antibody (ANA) result to narrow down which autoimmune condition may be present. The test is also called the ENA panel, anti-ENA test or ENA antibody panel.
What Does an Extractable Nuclear Antigen (ENA) Profile Test Measure?
The ENA antibody panel checks for six key autoantibodies. Each one is linked to a different autoimmune condition, so identifying which antibody is present helps guide diagnosis. The table below summarises each parameter:
| Parameter | What It Indicates |
|---|---|
| Anti-SSA/Ro | Associated with Sjögren's syndrome and lupus; can cross the placenta during pregnancy |
| Anti-SSB/La | Commonly linked to Sjögren's syndrome |
| Anti-Sm (Smith) | Highly specific marker for systemic lupus erythematosus (SLE) |
| Anti-RNP (Ribonucleoprotein) | May point to mixed connective tissue disease (MCTD), SLE, or systemic sclerosis |
| Anti-Scl-70 (Topoisomerase I) | Specific marker for scleroderma (systemic sclerosis); detected in around 60% of cases |
| Anti-Jo-1 (Histidyl-tRNA Synthetase) | Specific marker for polymyositis, a condition causing muscle inflammation and weakness |
Why Is an Extractable Nuclear Antigen (ENA) Profile Test Done?
An ENA panel is ordered when a doctor suspects an autoimmune disorder based on a patient's symptoms or earlier test results.
Common Symptoms That May Require This Test
The following symptoms often lead a doctor to request an anti-ENA test:
- Persistent, unexplained fatigue
- Joint pain and swelling
- Skin rashes, including a butterfly-shaped rash across the cheeks
- Unexplained low-grade fever
- Muscle weakness
- Dry eyes or dry mouth
- Sensitivity to sunlight
Conditions This Test Can Help Detect
The ENA antibody panel can help identify several autoimmune conditions. These include:
- Systemic lupus erythematosus (SLE)
- Sjögren's syndrome
- Systemic sclerosis (scleroderma)
- Mixed connective tissue disease (MCTD)
- Polymyositis
- Dermatomyositis
Extractable Nuclear Antigen (ENA) Profile Test During Pregnancy
If you are pregnant and have a known lupus diagnosis, your doctor may recommend an ENA panel to monitor for neonatal lupus. This is a condition in which certain autoantibodies, particularly anti-SSA/Ro and anti-SSB/La, pass through the placenta to the foetus. In a small number of pregnancies, this can lead to complications such as congenital heart block in the developing baby.
Extractable Nuclear Antigen (ENA) Profile Test for Chronic Disease Monitoring
For patients already diagnosed with an autoimmune condition, the ENA profile test can play a role in tracking disease activity over time. Research shows that changes in anti-ENA antibody levels correlate with disease progression and response to treatment. Repeat testing helps doctors assess whether a condition is worsening, stable, or responding to therapy.
How to Prepare and What to Expect
No special preparation is needed for the extractable nuclear antigen (ENA) profile test, but the following guidance will help your visit go smoothly.
Do You Need to Fast?
No, fasting is not required before this test. You can eat and drink as normal beforehand. However, if your doctor has ordered other tests alongside the ENA panel, check whether those tests have their own fasting requirements.
Practical Tips Before Your Test
A few simple steps can make your sample collection easier:
- Drink plenty of water before your appointment to keep veins accessible for the blood draw
- Tell your doctor about all medications you are currently taking, particularly immunosuppressive medicines, as these can affect antibody levels
- Wear clothing with sleeves that are easy to roll up
Step-by-Step Procedure
Here is what to expect during the sample collection:
- A trained phlebotomist (blood collection specialist) will ask you to sit comfortably and extend your arm.
- A small area on your inner arm is cleaned with an antiseptic swab.
- A fine needle is inserted into a vein to draw a small amount of blood into a collection tube.
- The needle is removed, and a small bandage is placed over the site.
- The entire procedure takes roughly 5 to 10 minutes, with minimal discomfort.
- Your blood sample is labelled and sent to the laboratory for analysis.
Factors That Can Affect Accuracy
The following factors may influence your test results:
- Immunosuppressive medications, which can lower detectable antibody levels
- Recent infections, which may temporarily alter immune activity
- Dehydration, which can affect sample quality
- The laboratory method used
- Improper sample handling or storage during transport
Understanding Your Extractable Nuclear Antigen (ENA) Profile Test Results
Your doctor will review your results alongside your symptoms, medical history, and other tests before drawing any conclusions. The table below shows the normal reference range for each parameter in the extractable nuclear antigen (ENA) profile test:
| Antibodies | Negative | Positive |
|---|---|---|
| SS-A/Ro antibodies, IgG | < 1.0 U | ≥ 1.0 U |
| SS-B/La antibodies, IgG | < 1.0 U | ≥ 1.0 U |
| Sm antibodies, IgG | < 1.0 U | ≥ 1.0 U |
| RNP antibodies, IgG | < 1.0 U | ≥ 1.0 U |
| Scl 70 antibodies, IgG | ≤ 1.0 U | ≥ 1.0 U |
| Jo 1 antibodies, IgG | < 1.0 U | ≥ 1.0 U |
These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
ENA antibodies can occasionally be detected in older adults who have no autoimmune disease. For this reason, a positive result must always be read alongside clinical symptoms and the patient's full medical history. Patients on immunosuppressive therapy may show lower antibody levels, which could affect result interpretation. During pregnancy, the presence of anti-SSA/Ro and anti-SSB/La antibodies carries additional significance due to the risk of those antibodies crossing the placenta.
How to Maintain Healthy Levels
While there is no direct way to prevent autoantibody formation, general wellness habits support overall immune health:
- Follow a balanced diet with plenty of vegetables, whole grains, and lean proteins
- Stay physically active with moderate, regular exercise
- Keep all follow-up appointments so your doctor can track any changes over time
Lupin Diagnostics Extractable Nuclear Antigen (ENA) Profile Test Price and Home Collection
The extractable nuclear antigen (ENA) profile test price starts at approximately ₹7800, with home collection available across major Indian cities. City-wise approximate prices are listed below:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹7800 |
| Bengaluru | ₹7800 |
| Chennai | ₹7800 |
| Hyderabad | ₹7800 |
| Kolkata | ₹8400 |
| Pune | ₹7800 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book your test:
- 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 extractable nuclear antigen (ENA) profile test across multiple cities, so you can book a visit from a certified phlebotomist at a time that suits you. All samples are processed in NABL-accredited laboratories, ensuring accurate and reliable results. Your digital report is delivered directly to your email or WhatsApp once it is ready.
Frequently Asked Questions
The ENA profile test helps doctors identify and monitor autoimmune conditions in which the immune system attacks the body's own tissues. It is usually ordered after a positive ANA test to find out which specific autoantibodies are present, helping to narrow down the diagnosis.
No, fasting is not required. You can eat and drink normally on the day of your test. If your doctor has ordered additional tests at the same time, check whether those have separate preparation requirements.
A positive result means the test detected one or more specific autoantibodies in your blood. However, a positive finding alone does not confirm a particular diagnosis. Your doctor will consider your symptoms, clinical history, and other investigations before reaching any conclusion.
Yes, this is possible. ENA antibodies are occasionally found in people, particularly older adults, who do not have any diagnosed autoimmune condition. This is why results must always be interpreted within the full clinical picture.
If a pregnant woman carries anti-SSA/Ro or anti-SSB/La antibodies, there is a small risk these may pass to the foetus through the placenta. This can lead to neonatal lupus, which in rare cases causes congenital heart block. Doctors may recommend the extractable nuclear antigen (ENA) profile test to monitor this risk throughout pregnancy.
The frequency of repeat testing depends on your individual circumstances and is best determined by your treating doctor. In general, it may be repeated periodically to assess disease activity or to check how well a treatment is working.
A qualitative ENA antibody panel reports whether specific antibodies are present or absent. A quantitative profile goes further and measures the amount of each antibody in the blood. Quantitative results can be useful for tracking disease activity and evaluating how well a patient is responding to treatment over time.
Extractable Nuclear Antigen (ENA) Profile Test
