Thyroid Stimulating Immunoglobulin




Test Mnemonic

TSIGIM

CPT Codes

  • 84445 - QTY (1)

LOINC ®

30166-3

Aliases

  • TSI

Performing Laboratory

n/a


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mLSerumSST (Gold) Refrigerated 

Alternate Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.5 mLPlasmaLithium heparin PST (Lt. Green)   

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.35 mL    Submitting the minimum volume will not allow for repeat testing or addons. Required volume of 0.5mL is preferred when possible.

Stability

Environmental Condition Description
Ambient24 hours
Refrigerated7 days
Frozen1 year

Days Performed

Mon - Fri

Turnaround Time

1 - 4 days

Methodology

Name Description
Chemiluminescence Immunoassay (CLIA) 

Reference Range

Thyroid Stimulating Immunoglobulin
Sex Age From Age To Type Range Range Unit
       Normal<0.55IU/L
TSI Qualitative
Sex Age From Age To Type Range Range Unit
       NormalNegative 

Clinical Info

The measurement of thyroid stimulating autoantibodies, in conjunction with other clinical and laboratory findings, is used as an aid in the diagnosis of patients suspected of having Graves' disease.

Clinical Limitation

Avoid hemolysis.