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HelpTest Code T4 T4 (Thyroxine), Total, Serum
Additional Codes
LAB126
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 | 2 hours |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 30 days |
Reference or Target Ranges
| Age | Male | Female |
| < 5 days | 5.0 - 18.5 | 5.0 - 18.5 |
| 6 days to 2 months | 5.4 - 17 | 5.4 - 17 |
| 3 months to 1 year | 5.7 - 16 | 5.7 - 16 |
| > 1 year | 4.5 - 11 | 4.5 - 11 |
Reportable Units
ng/ml
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 2300 mg/dL |
| Icterus Threshold | 37 mg/dL |
| Lipemia Threshold | 2500 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
84436
Last review/edit date
2025