Thyroid Stimulating Immunoglobulin (TSH receptor antibodies)
Label Mnemonic: | TSI |
Epic code: | LAB4165 |
Downtime form: | A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery |
Commercial Mailout Laboratory
6240-8 RCP
356-8593
6240-8 RCP
356-8593
Specimen(s):
Serum
Collection Medium:
![]() |
Red top tube 5 mL (Clot Activator) |
Minimum:
Preferred Minimum: 1.0 mL serum
Absolute Minimum: 0.5 mL serum
Absolute Minimum: 0.5 mL serum
Rejection Criteria:
Plasma
Turn Around
Time:
Within 24 hours upon receipt at reference laboratory
Reference Range:
0.54 IU/L or less - Consistent with healthy thyroid function or non-Graves thyroid or autoimmune disease. Those with healthy thyroid function typically have results less than 0.1 IU/L. 0.55 IU/L or greater - Consistent with Graves disease (autoimmune hyperthyroidism).
Interpretive Data:
This assay specifically detects thyroid stimulating autoantibodies. For diagnostic purposes, the results obtained from this assay should be used in combination with clinical examination, patient medical history, and other findings.
Methodology:
Semi-Quantitative Chemiluminescent Immunoassay
CPT Code:
84445