Thyroid Stimulating Immunoglobulin
| Abbrev Code: | TSIS | ||
| Order Code: | LAB746 | Order Name: | Thyroid Stimulating Immunoglobulin |
| Synonyms: | TSI; Gravis Disease | ||
| Methodology: | Recombinant bioassay | ||
| CPT Codes: | 84445 x1 | ||
| Turnaround Time: | Specimens are sent to reference laboratory Mon-Fri; results are reported within 2-6 days. | ||
| Compliance: | This test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared by the U.S. Food and Drug Administration. |
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Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 1 mL |
| Minimum\Peds Volume: | 0.4 mL |
| Container: | Red (no gel) Alternate Containers: Red or gold (gel) |
| Causes for Rejection: | Gross hemolysis. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 0.5 mL, 0.1 mL minimum. Store refrigerated or frozen. |
| Shipping Instructions: | Ship frozen. |
| Stability: | 24 hours at room temperature; 7 days refrigerated; 60 days frozen (preferred). |
| Test Performed at or Referral Lab | Lab Sendouts (Mayo) |
| Referral Lab number: | TSI |
Interpretive
| Reference Range: | Less than or equal to 1.3 TSI index. |
| Use: | The test is often used in the diagnosis of patients with normal routine thyroid tests, but in whom progressive exopthalemia and/or Grave's disease is still suspected. |
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