ARUP's Laboratory Test Directory

0099430: Thyroid Stimulating Immunoglobulin

Test Mnemonic: TSI
Methodology: Bioassay/Chemiluminescence

Performed: Mon, Tue, Thu, Sat

Reported: 2-5 days

Specimen Required:  
Collect: One 4 mL SST.

Transport: 1 mL serum, frozen. (Min: 0.7 mL)  Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.7 mL serum, frozen.

Unacceptable Conditions: Plasma.

Stability: After separation from cells: Ambient: 2 hours; Refrigerated: 6 days; Frozen: 3 months

Reference Interval:
Negative - 109% basal activity or less 
Indeterminate - 110-129% basal activity
Positive - 130% basal activity or greater

Interpretive Data:
Positive results (130% or greater) are consistent with Graves disease.



Note:
For any results 130% and above, the following statement will be added: "An elevated TSH value above 10 mIU/L may produce a low positive result."

CPT Code(s):
84445

 

 

 
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