Thyroid Stimulating Immunoglobulin


Sunquest Code:TSIS  
Epic Code:LAB746Epic Name:Thyroid Stimulating Immunoglobulin
Synonyms:TSI; Gravis Disease
Methodology:Recombinant bioassay
CPT Code:84445
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 2-6 days.
Compliance:

This test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared by the U.S. Food and Drug Administration.



Collection Instructions

Specimen:Blood
Optimal Volume:1 mL
Minimum\Peds Volume:0.4 mL
Container:Red (no gel) (Red or gold (gel))
Causes for Rejection:Gross hemolysis.


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 0.5 mL, 0.1 mL minimum. Store refrigerated or frozen.
Shipping Instructions:Ship frozen.
Test Performed at or Referral Lab Lab Sendouts  (Mayo)
Referral Lab number:TSI


Interpretive

Reference Range:Less than or equal to 1.3 TSI index.
Use:The test is often used in the diagnosis of patients with normal routine thyroid tests, but in whom progressive exopthalemia and/or Grave's disease is still suspected.


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