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HelpTest Code T3 T3 (Triiodothyronine), Total, Serum
Additional Codes
LAB2168
Performing Laboratory
Central Peninsula Hospital
Collection Method
Venipuncture
Container
Gold Top SST
Specimen Type
Preferred
- Serum- Gold Top SST or Red Top
Acceptable
- Plasma- Light Green Top (Lithium heparin)
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 8 days |
| Refrigerated (4°C to 8°C) | 14 days |
| Frozen(-40°C to 0°C) | 1 year |
Reference or Target Ranges
| Age | Male | Female |
| <5 days | 0.7 - 2.9 | 0.7 - 2.9 |
| 5 days to 1 year | 0.8 - 2.8 | 0.8 - 2.8 |
| 1 - 10 years | 0.9 - 2.4 | 0.9 - 2.4 |
| 11 - 17 years | 0.9 - 2.1 | 0.9 - 2.1 |
| > 18 years | 0.8 - 2.0 | 0.8 - 2.0 |
Reportable Units
ng/ml
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 2000 mg/dL |
| Icterus Threshold | 35 mg/dL |
| Lipemia Threshold | 1800 mg/dL |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
84480
Last review/edit date
2025