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TSI / TSI-M
THYROID-STIMULATING IMMUNOGLOBULIN (TSI), SERUM

Test Code TSI / TSI-M 
Test THYROID-STIMULATING IMMUNOGLOBULIN (TSI), SERUM 
Methodology Recombinant Bioassay 
Description Useful for evaluation of patients with hyperthyroidism or Grave's disease. This test is often used in the diagnosis of patients with normal routine thyroid tests but in whom progressive exophthalemia and/or Graves' disease is still suspected. 
Specimen Draw blood in a plain, red-top tube(preferred) or a serum gel tube.
Spin down and send 0.5 mL (minimum: 0.1 mL) of serum refrigerated. 
Reference Values <=1.3 TSI Index
Reference values apply to all ages 
Analytic Time 2 Days 
Day(s) Test Set Up Tuesday through Friday 
CPT Code(s) 84445