Thyroid Stimulating Immunoglobulin (TSI) - Serum

Specimen Type



Quest Diagnostics


Hormonal Health


8 days

Thyroid Stimulating Immunoglobulin (TSI)

Source:;Accessed 3-Nov-2016

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.

Results Included in this Test


  • Thyroid Stimulating Immunoglobulin (TSI)