Thyroid Stimulating Immunoglobulin
Test Mnemonic
TSIGIM
CPT Codes
- 84445 - QTY (1)
LOINC ®
30166-3
Aliases
- TSI
Performing Laboratory
Cleveland Clinic Laboratories
FDA Category
In Vitro Diagnostic
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Serum | SST (Gold) | Refrigerated |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL | Plasma | Lithium heparin PST (Lt. Green) |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.35 mL | Submitting the minimum volume will not allow for repeat testing or addons. Required volume of 0.5mL is preferred when possible. |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 24 hours |
| Refrigerated | 7 days |
| Frozen | 1 year |
Days Performed
Mon - Fri
Turnaround Time
1 - 4 days
Methodology
| Name | Description |
|---|---|
| Chemiluminescence Immunoassay (CLIA) |
Reference Range
| Thyroid Stimulating Immunoglobulin | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | <0.55 | IU/L | |||
| TSI Qualitative | |||||
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | Negative |
Clinical Info
The measurement of thyroid stimulating autoantibodies, in conjunction with other clinical and laboratory findings, is used as an aid in the diagnosis of patients suspected of having Graves' disease.
Clinical Limitation
Avoid hemolysis.