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TSI (Thyroid Stimulating Immunoglobulin)

Test Name

TSI (Thyroid Stimulating Immunoglobulin)

Also known as

TSI (Thyroid Stimulating Immunoglobulin)

Symptoms | Disorders | Treatments

About test

TSI (Thyroid Stimulating Immunoglobulin) - Graves' disease is a classic form of hyperthyroid disease, affecting approximately 0.4% of the population of the United States. It is caused by IgG immunoglobulins, collectively known as thyroid stimulating immunoglobulins (TSI). Patients who are candidates for antithyroid drug therapy may not respond to this treatment when TSI levels are markedly elevated. The determination of TSI can also assist in predicting hyperthyroidism in neonates, due to placental transmission of the immunoglobulins from a mother with hyperthyroidism.