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HelpTest Code T3-A T3, Total
Synonyms/Keywords
Triiodothyronine, T-3, T3 Uptake, T3 Total
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No | Plasma/Serum | Lithium Heparin Plasma Separator Tube (PST) | Lithium Heparin Green Top Tube (GTT), Serum Separator Tube (SST), Red Top Tube (RTT) | 1.0 mL | 0.5 mL | 0.3 mL |
Collection/Processing Instructions
GTT/RTT- physically separate plasma or serum from contact with cells as soon as possible or before transport.
Samples collected in a RTT must be removed from the cells within one hour for storage or transport. Samples collected in gel barrier tubes must be removed from the primary tube prior to transporting to Marshfield.
Do not send the primary collection tube.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 8 hours |
| Refrigerate | 2 days | |
| Frozen | > 2 days |
Rejection Criteria
Marked Icterus
Reference Range Information
| Performing Location | Reference Range | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Marshfield |
|
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Sunday | Less than 2 hours | Immunoenzymatic assay/ Beckman Coulter Unicel DXI |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84480 | 1 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84480 | 1 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | T3 total |