What Is a Thyroid-Stimulating Immunoglobulin Test?

What is a thyroid-stimulating immunoglobulin (TSI) level test?

The TSI test is a blood test that measures the level of thyroid-stimulating immunoglobulin (TSI) in the blood.

TSIs are autoantibodies that make the thyroid gland produce and release more thyroid hormone. If unlimited, excessive thyroid hormone (signs of hyperthyroidism) may lead to autoimmune thyroid disease.

Therefore, the test (by measuring the TSI level) helps diagnose autoimmune thyroid disease, including:

  • Thyrotoxicosis;
  • Graves’ disease.

In addition, if you’re pregnant and have a history of thyroid problems, your doctor may also order a TSI test.


Keywords: thyroid-stimulating immunoglobulin level test; TSI level test; TSI test; thyroid-stimulating immunoglobulin test.

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