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HelpTest Code FREE T3 T3 (Triiodothyronine), Free, Serum
Additional Codes
LAB137
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 | 5 days |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 1 month |
Reference or Target Ranges
| Age | Male | Female |
| < 1 month | Reference Range Not Established | Reference Range Not Established |
| 1 - 23 months | 3.3 - 5.2 | 3.3 - 5.2 |
| 2 -12 years | 3.3 - 4.8 | 3.3 - 4.8 |
| 13 - 20 years | 3.0 - 4.7 | 3.0 - 4.7 |
| > 18 years | 2.5 - 4.4 | 2.5 - 4.4 |
Reportable Units
pg/ml
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 4300 mg/dL |
| Icterus Threshold | 33 mg/dL |
| Lipemia Threshold | 2000 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
84481
Last review/edit date
2025