Thyroid-stimulating Immunoglobulin (TSI)
Test Code: 140749
Performing Lab: LabCorp
CPT Code: 84445 001
Synonym
Human Thyroid Stimulator (HTS); Long-acting Thyroid Stimulator (LATS)
Specimen Type
Serum (preferred) or plasma (EDTA or heparin)
Specimen Container
Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube
Volume
1 mL
Minimum Volume
0.3 mL (NOTE:This volume does NOT allow for repeat testing.)
Specimen Handling
Serum must be separated from blood cells by centrifugation, ideally within 2 hours of collection. If red-top tube is used, transfer separated serum to a plastic transport tube.
Patient Prep
Prepare sterile venipuncture site.
Unacceptable Conditions
Gross lipemia contaminated with anticoagulants; plasma specimen; icteric, hemolytic, or lipemic serum
Temperature
Room Temperature
Methodology
The IMMULITE 2000 TSI assay designed for the specific Semi- Quantitative detection of stimulating autoantibodies using a bridging format and human TSH receptor fragment chimeric recombinant proteins. The capture and detection proteins are designed to be specific for antibodies that stimulate the native receptor. This method provides a determination of thyroid stimulating autoantibodies that are specific to TSH receptors in human serum or plasma. The assay is traceable to WHO NIBSC 08/204.[1]
Stability
Room Temperature: 14 days
Refrigerated: 14 days
Frozen: 14 days
Refrigerated: 14 days
Frozen: 14 days
| Result Code | Result Name | LOINC |
|---|---|---|
| 140754 | Thyroid Stim Immunoglobulin | 30567-2 |
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