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| 88620:THYROID STIMULATING IMMUNOGLOBULIN (TSI) | |||||||||
| Alias Names: | TSI | ||||||||
| Methodology: | Bioassay / Chemiluminescence (CL) | ||||||||
| Edit Date: | 11/15/2006 | ||||||||
| Performed: | Monday, Tuesday, Thursday, Saturday | ||||||||
| Released: | 2-5 days after setup at PeaceHealth Laboratories’ reference lab. | ||||||||
| CPT Code: | 84445-90 | ||||||||
| Specimen Collection Details | |||||||||
| Collection: | One 7.5 mL serum separator tube (SST). Also acceptable: One 5 mL red top tube. | ||||||||
| Handling: | Allow to clot, centrifuge and separate serum from cells into a plastic vial. Freeze. Allow no more than one freeze/thaw cycle. If multiple tests are ordered, send separate specimen for this test. | ||||||||
| Stability: | Specimen stable 2 hours ambient, 6 days refrigerated, or 3 months frozen. | ||||||||
| Standard Volume: | 1 mL serum. | ||||||||
| Minimum Volume: | 0.7 mL serum. | ||||||||
| Transport: | Frozen on dry ice. | ||||||||
| Rejection Criteria: | Plasma; specimen frozen and thawed more than once. | ||||||||
| Negative |
≤ 109% basal activity
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| Indeterminate |
110- 129% basal activity
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| Positive |
≥ 130% basal acitvity is consistent with Graves’ disease.
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