ARUP's Laboratory Test Directory

Thyroid Stimulating Immunoglobulin : 0099430

Mnemonic: TSI

Methodology: Bioassay/Chemiluminescence
Performed: Mon, Tue, Thu, Sat
Reported: 2-5 days
Specimen Required: Collect:  One 4 mL serum separator tube.

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

Unacceptable Conditions:  Plasma.

Stability (collection to initiation of testing):  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
Cross References: TSI
 
 

 

 

 
All ARUP Sites:        www.aruplab.com     ·     www.arupconsult.com     ·     www.arup.utah.edu     ·     www.childx.org     ·     www.utahblood.org