7580 TSI (Thyroid Stimulating Immunoglobulin)

Specimen Type Specimen Stability Reference Range
Serum 21 Days, Refrigerated
60 Days, Frozen
See Report

Specimen Requirements

Specimen Type: Serum
Container: 1 Serum Separator Tube (SST)
Temperature: Refrigerated
Preferred Vol: 1.00 mL
Min Vol: 0.20 mL




Tuesday - Saturday

Turn-Around Time



Clinical Utility

Graves disease is a classic form of hyperthyroid disease, affecting approximately 0.4% of the population in 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 mother with a hyperthyroidism.

CPT Codes


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