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Test Directory

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

Method

Immunoassay

Schedule

Tuesday - Saturday

Turn-Around Time

Send-Out

Instructions/Notes

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

84445

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