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Anti Thyroglobulin Antibodies (ATG)


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Serum, Thyroglobulin is a key protein in the thyroid gland that is essential for the synthesis of thyroxine (T4) and triiodothyronine (T3). Antithyroglobulin antibody test measures levels of antibodies to thyroglobulin. This test helps to identify autoimmune diseases involving the thyroid gland. The presence of thyroid autoantibodies causes disorders such as Hashimoto’s thyroiditis, Graves’ disease, Hypothyroidism, Thyroid cancer, etc. Women with high levels of ATG might miscarry or be infertile. While in cases of neonatal hypothyroidism, the detection of ATG in the infant suggests transplacental antibody transfer, particularly if the mother has a history of autoimmune thyroiditis or detectable thyroid autoantibodies., Non Fasting

sample requiredSample Required:

Blood sample drawn from a vein, usually from the arm.

test timeTest Time: 

The test is usually completed within a few hours to a day.

test normal rangeTest Normal Range: 

The normal range for anti thyroglobulin antibodies varies among laboratories. Generally, low or undetectable levels are considered normal.

what is the testWhat is the Test? 

The Anti Thyroglobulin Antibodies (ATG) test measures the level of antibodies against thyroglobulin, a protein produced by the thyroid gland. Elevated levels of these antibodies can indicate thyroid autoimmune disorders.

test procedureTest Procedure: 

From a vein in your arm, blood is extracted. The sample is then processed in a laboratory to measure the level of anti thyroglobulin antibodies.

when to take the testWhen to Take the Test: 

The test is ordered to help diagnose autoimmune thyroid diseases, such as Hashimoto’s thyroiditis and Graves’ disease. It can also be used to monitor the progress of these conditions and the effectiveness of treatment.

who should take this testWho Should Take This Test: 

Individuals with suspected thyroid autoimmune disorders, abnormal thyroid function test results, or a family history of thyroid conditions may undergo this test.

precautions for exceptional casesPrecautions for Exceptional Cases (Pregnancy etc.): 

Pregnant individuals should inform their healthcare provider before the test, as pregnancy can influence thyroid antibody levels.


Q1: What do elevated anti thyroglobulin antibody levels indicate?

A: Elevated levels are associated with autoimmune thyroid disorders like Hashimoto’s thyroiditis or Graves’ disease.

Q2: Is fasting required for the anti thyroglobulin antibodies test?

A:No, you don’t need to fast before taking this test.

Q3: Can this test be used to diagnose thyroid cancer?

A: It’s not typically used to diagnose thyroid cancer, but it may be ordered to monitor thyroid cancer patients.

Q4. Are there any medications that affect the test results?

A: Some medications, like steroids, can affect antibody levels. It’s important to inform your doctor about all medications you’re taking.

Q5. Can I continue my regular medications before the test?

A: In general, yes. But inform your healthcare provider about any medications or supplements you’re taking before the test.

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