TSH Receptor Antibody (TRAb) Test: Booking, Price, and Results
About TSH Receptor Antibody (TRAb) Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | TRAb Test, Thyrotropin Receptor Antibody Test, TSI (Thyroid-Stimulating Immunoglobulin) Test, TBII (Thyroid-Binding Inhibitory Immunoglobulin) Test, Anti-TSHR Test |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting required |
| Report Time | 3 to 7 days |
| Recommended For | All adults with suspected autoimmune thyroid disease; males and females |
| Price | Starting at ₹1600 |
What Is a TSH Receptor Antibody (TRAb) Test?
The TSH receptor antibody (TRAb) test is a blood test that detects autoantibodies directed against the TSH receptor found on thyroid cells. It is prescribed when a doctor suspects an autoimmune thyroid condition, particularly Graves' disease. A small sample of blood is drawn from a vein in the arm and sent to the laboratory for analysis. The test is also referred to as the TRAb test, thyrotropin receptor antibody test, TSI (thyroid-stimulating immunoglobulin) test, TBII (thyroid-binding inhibitory immunoglobulin) test, or anti-TSHR test.
What Does a TSH Receptor Antibody (TRAb) Test Measure?
The TSH receptor antibody (TRAb) test measures the autoantibodies that attach to the TSH receptor on thyroid cells. Here is why it matters:
| Parameter | What It Tells You |
|---|---|
| TSH Receptor Antibodies (TRAb) | Depending on their activity, they may either overstimulate the thyroid (thyroid-stimulating antibodies) or suppress it (thyroid-blocking antibodies). The balance between these two actions determines whether a person develops an overactive or underactive thyroid. |
Why Is a TSH Receptor Antibody (TRAb) Test Done?
Doctors order this test to identify the cause of thyroid dysfunction, particularly when an autoimmune origin is suspected. It is also used to monitor ongoing treatment and assess risk in pregnant patients.
Common Symptoms That May Require This Test
A doctor may recommend the anti-TSHR test if you experience any of the following symptoms:
- Unexplained weight loss despite normal or increased appetite
- Rapid or irregular heartbeat (palpitations)
- Anxiety, nervousness, or irritability
- Trembling hands or fingers
- Sensitivity to heat and excessive sweating
- Bulging eyes (a condition called exophthalmos)
- Fatigue or muscle weakness
Conditions This Test Can Help Detect
The TSH receptor antibody (TRAb) test can help identify or rule out several thyroid-related conditions. These include:
- Graves' disease (the most common cause of autoimmune hyperthyroidism)
- Hashimoto's thyroiditis with transient hyperthyroidism (Hashitoxicosis)
- Neonatal thyrotoxicosis caused by maternal antibodies crossing the placenta
- Thyroid eye disease, also known as Graves' ophthalmopathy
- Transient thyroiditis (to distinguish it from true autoimmune hyperthyroidism)
TSH Receptor Antibody (TRAb) Test During Pregnancy
Pregnant women with a history of Graves' disease are routinely tested for TRAb to assess the risk of foetal thyrotoxicosis. Because stimulating antibodies belong to the IgG class, they can cross the placenta and affect the developing baby. Women who conceive while on antithyroid medication are generally advised to have TRAb levels checked in early pregnancy, again at 18 to 22 weeks, and once more at 30 to 34 weeks if antibodies remain detectable.
TSH Receptor Antibody (TRAb) Test for Chronic Disease Monitoring
For patients already diagnosed with Graves' disease, the thyrotropin receptor antibody test is a valuable tool for tracking treatment response. Elevated TRAb levels at the end of a course of antithyroid medication therapy are strongly associated with a higher chance of relapse. Monitoring antibody levels at diagnosis, at 12 months into treatment, and again at around 18 months helps guide decisions about continuing or stopping medication.
How to Prepare and What to Expect
Preparation for the TRAb test is straightforward, and the collection procedure is quick and simple.
Do You Need to Fast?
No fasting is required before this test. You may eat and drink normally on the day of your appointment. However, if your doctor has ordered additional thyroid tests alongside this one, check with them whether any preparation is needed for those.
Practical Tips Before Your Test
A few simple steps will help ensure an accurate result:
- Stop taking biotin-containing supplements at least 12 to 72 hours before the test, as high-dose biotin can interfere with the assay
- Do not take heparin unless your doctor has specifically instructed you to continue
- Continue all other regular medications as prescribed, unless told otherwise
- Inform the laboratory or phlebotomist about any thyroid medications or recent treatments, including radioactive iodine therapy
- Wear a short-sleeved or loose-fitting top for easy access to your arm
Step-by-Step Procedure
Here is what happens from the moment you arrive for your blood collection:
- A trained phlebotomist cleans the skin on your inner arm with an antiseptic wipe.
- A small needle is gently inserted into a vein, usually in the crook of your elbow.
- A small amount of blood is collected into a labelled tube.
- The needle is removed, and a cotton ball or bandage is placed over the site.
- The sample is allowed to sit briefly so the serum separates from the blood cells, then it is centrifuged and prepared for dispatch.
- The sample is sent to an accredited laboratory for analysis.
Factors That Can Affect Accuracy
Certain factors may influence the reliability of your result:
- High-dose biotin supplementation can cause falsely low or falsely high readings
- Recent radioactive iodine therapy or antithyroid medication use may temporarily shift antibody levels
- Severe illness or pregnancy may cause fluctuations in antibody concentration
- Heterophile antibodies or antibodies to certain assay components (rare but may cause interference)
Understanding Your TSH Receptor Antibody (TRAb) Test Results
Your TSH receptor antibody (TRAb) test results should always be reviewed with your doctor, who will consider them alongside your symptoms, TSH levels, and overall medical history. The table below shows the interpretation of test results:
| TRAb Test Result | Interpretation |
|---|---|
| Positive TRAb | Suggests Graves’ disease or an increased risk of neonatal hyperthyroidism. |
| Negative TRAb | Low likelihood of Graves’ disease; further testing may be needed for other thyroid disorders. |
| Borderline or Equivocal | Requires additional evaluation with thyroid function tests (TFTs) and clinical assessment. |
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 situations can affect how results are interpreted:
- During pregnancy, antibody levels naturally fluctuate and must be considered alongside foetal monitoring findings.
- After radioactive iodine therapy, TRAb levels may temporarily rise, which does not necessarily indicate disease worsening.
- High-dose biotin supplementation can produce falsely abnormal readings, so always disclose supplement use to your doctor.
How to Maintain Healthy Levels
These general lifestyle habits support thyroid health and overall wellbeing:
- Attend regular follow-up appointments with your endocrinologist if you have been diagnosed with an autoimmune thyroid condition.
- Avoid smoking, as it is associated with a higher risk of Graves' ophthalmopathy (thyroid eye disease).
- Practise stress management techniques such as light exercise, adequate sleep, and relaxation, as chronic stress may worsen autoimmune conditions.
Lupin Diagnostics TSH Receptor Antibody (TRAb) Test Price and Home Collection
The TSH receptor antibody (TRAb) test price starts at ₹1600 and is available at Lupin Diagnostics, with home sample collection available across cities in India. The table below shows prices by city:
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹1600 |
| Bengaluru | ₹1600 |
| Hyderabad | ₹1600 |
| Chennai | ₹1600 |
| Kolkata | ₹1600 |
| Pune | ₹1600 |
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 blood collection for the TSI (thyroid-stimulating immunoglobulin) test across multiple cities. All samples are processed in NABL-accredited laboratories by experienced technologists. Your digital report is delivered securely via email or WhatsApp, so you can share it with your doctor without any delay.
Frequently Asked Questions
The TRAb test is primarily used to diagnose Graves' disease, the most common autoimmune cause of hyperthyroidism. It helps distinguish autoimmune thyroid disorders from other causes of thyroid overactivity and is also used to monitor treatment response.
No fasting is needed. You can eat and drink normally before the test. However, you should avoid high-dose biotin supplements for at least 12 to 72 hours beforehand, as biotin can interfere with test accuracy.
A positive result means autoantibodies against the TSH receptor were detected in your blood. When combined with a low TSH level and symptoms of hyperthyroidism, this typically points to Graves' disease. Your doctor will confirm the diagnosis based on the full clinical picture.
Pregnant women with a history of Graves' disease are tested because stimulating TRAb can cross the placenta and cause hyperthyroidism in the newborn. Monitoring these antibody levels during pregnancy allows doctors to assess and manage this risk appropriately.
No. The TSH receptor antibody (TRAb) test specifically measures antibodies against the TSH receptor, which are closely linked to Graves' disease. Other thyroid antibody tests, such as those for anti-TPO or anti-thyroglobulin antibodies, measure different antibodies and are associated with other conditions like Hashimoto's thyroiditis. Your doctor will choose the right test based on your symptoms and clinical findings.
The turnaround at Lupin Diagnostics is within 3 to 7 days. Your digital report is delivered securely via email or WhatsApp, so you can share it with your doctor without any delay.
TSH Receptor Antibody (TRAb) Test: Booking, Price, and Results
