Tissue Transglutaminase (tTG) IgA Antibody Test
About Tissue Transglutaminase (tTG) IgA Antibody Test
| Field | Value |
|---|---|
| Also Known As | tTG-IgA test, Anti-tTG IgA, IgA anti-tissue transglutaminase, Tissue Transglutaminase Antibody IgA, Coeliac antibody test |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting needed |
| Report Time | 24 to 72 hours |
| Recommended For | All ages, males and females |
| Price | Starting at ₹1,300 |
What Is a Tissue Transglutaminase (tTG) IgA Antibody Test?
The tissue transglutaminase (tTG) IgA antibody test is a blood test that checks for specific antibodies produced when the immune system reacts to gluten, a protein found in wheat, barley, and rye.
It is the most widely used first-line screening test for coeliac disease. Doctors also order it under the names tTG IgA test, anti-tTG IgA test, or coeliac antibody test. A small blood sample drawn from a vein in your arm is all that is needed.
What Does a Tissue Transglutaminase (tTG) IgA Antibody Test Measure?
The tissue transglutaminase antibody IgA test detects IgA antibodies that target tissue transglutaminase, an enzyme your body uses to repair damaged tissue. When someone with coeliac disease consumes gluten, their immune system mistakenly attacks this enzyme, producing measurable antibodies in the blood. The table below summarises what the test looks for.
| What Is Measured | Why It Matters |
|---|---|
| tTG-IgA antibodies | Indicates whether the immune system is reacting against gluten |
| Level of antibody response | Helps assess the degree of immune reaction and guides further testing |
Why Is a Tissue Transglutaminase (tTG) IgA Antibody Test Done?
The IgA anti-tissue transglutaminase test is ordered when a doctor suspects coeliac disease or a related gluten-driven condition. It is also used to track how well a patient is following a gluten-free diet.
Common Symptoms That May Require This Test
A doctor may recommend this test if you experience any of the following symptoms:
- Persistent diarrhoea or loose stools
- Bloating and abdominal discomfort
- Unexplained weight loss
- Chronic fatigue and low energy
- Iron-deficiency anaemia that does not respond to treatment
- Nausea or constipation
- Mouth ulcers that keep recurring
Conditions This Test Can Help Detect
The tTG IgA blood test helps identify several conditions, including:
- Coeliac disease (also called gluten-sensitive enteropathy)
- Dermatitis herpetiformis, an itchy, blistering skin rash linked to gluten sensitivity
- Immune response to gluten in patients already being assessed for digestive disorders
Tissue Transglutaminase (tTG) IgA Antibody Test for Chronic Disease Monitoring
This test plays an important role in long-term monitoring. Once a patient with coeliac disease or dermatitis herpetiformis begins a gluten-free diet, the test is repeated periodically to check whether antibody levels are falling. It can take up to one year for levels to fully normalise. For patients with Type 1 diabetes, testing is recommended soon after diagnosis and again within two and five years, given the higher risk of coeliac disease in this group.
How to Prepare and What to Expect
Getting ready for the tissue transglutaminase IgA test is straightforward, but one key preparation step is easy to overlook: your diet before the test matters greatly.
Do You Need to Fast?
No fasting is required before this test. You can eat and drink normally on the day of your appointment.
Practical Tips Before Your Test
Keep the following points in mind before you go for sample collection:
- Continue eating gluten-containing foods regularly before the test, as advised by your doctor. Avoiding gluten beforehand can produce inaccurate results.
- Inform the collection staff about any ongoing medications or existing health conditions.
- Stay well hydrated before your appointment.
- Wear a loose-fitting top or short sleeves for easy access to your arm.
Step-by-Step Procedure
The blood collection process is quick and causes minimal discomfort. Here is what to expect:
- A tourniquet (elastic band) is placed around your upper arm to make the vein more visible
- You will be asked to make a fist so blood fills the vein
- A trained phlebotomist cleans the skin at the collection site to prevent any risk of infection
- A thin needle is gently inserted into a vein, and blood is drawn into a specialised collection tube
- The needle is removed, and a small cotton swab or bandage is placed on the site
- The sample is labelled and sent to the laboratory for analysis
Factors That Can Affect Accuracy
Certain factors can influence the reliability of your tTG IgA blood test result:
- Eating a gluten-free diet before the test is the most common cause of a false-negative result
- IgA deficiency in the body can also cause a falsely low or negative result
- Autoimmune conditions such as type 1 diabetes, autoimmune liver disease, or rheumatoid arthritis may occasionally produce false-positive readings
- Liver cirrhosis and acute viral infections have been associated with false-positive antibody levels
Understanding Your Tissue Transglutaminase (tTG) IgA Antibody Test Results
Results should always be reviewed alongside your symptoms, medical history, and, where needed, further tests such as an intestinal biopsy. The table below shows the general interpretation of tTG-IgA levels.
| Result | Level (U/mL) | Interpretation |
|---|---|---|
| Negative | Less than 4.0 | Coeliac disease is unlikely (if total IgA is normal) |
| Borderline / Weak Positive | 4.0 to 10.0 | Mild immune response; further investigation may be needed |
| Positive | Greater than 10.0 | Consistent with coeliac disease or dermatitis herpetiformis |
Note: Reference ranges can vary slightly between laboratories. Some labs use a normal cut-off of less than 15 U/mL. Always check the range printed on your report.
Disclaimer: 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
Certain health situations can alter how results are read:
People with IgA deficiency may show falsely low tTG-IgA levels. In such cases, doctors often request an alternative test using tTG-IgG antibodies. Patients with liver cirrhosis may show false-positive IgA anti-tTG results due to elevated immunoglobulin levels in the blood. Autoimmune conditions, including Hashimoto's thyroiditis, psoriatic arthritis, and type 1 diabetes, carry a small risk of producing a false-positive result even without coeliac disease being present. Acute viral infections have been linked to the temporary appearance of low-level autoantibodies, which may affect results.
How to Maintain Healthy Levels
The following general wellness steps may support gut health and overall wellbeing:
- If diagnosed with coeliac disease, adopting a strict gluten-free diet is the primary way to bring antibody levels down over time
- Ensure adequate calcium intake per day, as coeliac disease can affect nutrient absorption
- Work with a qualified dietitian experienced in gluten-free eating to get personalised dietary guidance
Lupin Diagnostics Tissue Transglutaminase (tTG) IgA Antibody Test Price and Home Collection
The tissue transglutaminase IgA test price starts at approximately ₹1,300, with home collection available across major Indian cities. The table below gives an overview of city-wise pricing.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹1,300 |
| Bangalore | ₹1,300 |
| Indore | ₹1,300 |
| Pune | ₹1,300 |
| Chennai | ₹1,300 |
| Hyderabad | ₹1,300 |
| Kolkata | ₹1,300 |
| Bhopal | ₹1,300 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
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 across cities, so you can have blood drawn at a time and place that suits you. All samples are processed in NABL-accredited laboratories by experienced technologists. Your digital report is delivered directly to your email or WhatsApp, making it easy to share with your doctor.
Frequently Asked Questions
The tTG IgA test is primarily used to screen for coeliac disease, a condition where the immune system reacts to gluten and damages the small intestine. It is also used to monitor how well a patient is responding to a gluten-free diet once coeliac disease has been diagnosed.
No fasting is required. You can eat and drink as you normally would before the test. The only important dietary instruction is to continue consuming gluten-containing foods before the test, not to avoid them.
If you stop eating gluten before the anti-tTG IgA test, your antibody levels may fall and produce a falsely normal result. For the most reliable results, continue eating gluten-containing foods regularly before your test, unless your doctor advises otherwise.
A positive result indicates that your body is producing antibodies in response to gluten, which strongly suggests coeliac disease. Your doctor will usually recommend further investigation, such as an intestinal biopsy, to confirm the diagnosis.
Yes, in certain situations. People with IgA deficiency may receive a false-negative result. False-positive results can occur in people with autoimmune conditions such as type 1 diabetes, autoimmune liver disease, or liver cirrhosis. Your doctor will consider your full medical history when interpreting results.
Antibody levels generally begin to fall within weeks to months of strictly following a gluten-free diet. In some people, it can take up to one year for the tTG IgA levels to fully normalise, which is why follow-up testing is recommended.
People with a family history of coeliac disease, those with type 1 diabetes, or those with autoimmune thyroid conditions are at higher risk and may benefit from screening. Anyone experiencing persistent digestive symptoms such as chronic diarrhoea, bloating, or unexplained weight loss should speak to their doctor about whether this test is appropriate.
Tissue Transglutaminase (tTG) IgA Antibody Test
