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