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HelpTest Code FREE T4 T4 (Thyroxine), Free, Serum
Additional Codes
LAB127
Collection Method
Venous collection
Minimum Volume
0.5ml
Container
Gold Top SST
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Plasma:
- Light Geen Top (lithium heparin)
Reference or Target Ranges
| Age | Male | Female |
| 0 - 5 days | 0.9 - 2.5 | 0.9 - 2.5 |
| 6 days - 2 months | 0.9 - 2.2 | 0.9 - 2.2 |
| 3 - 11 months | 0.9 - 2.0 | 0.9 - 2.0 |
| 1 - 5 years | 1.0 - 1.8 | 1.0 - 1.8 |
| > 6 years | 0.9 - 1.7 | 0.9 - 1.7 |
Reportable Units
ng/dL
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 1000 mg/dL |
| Icterus Threshold | 41 mg/dL |
| Lipemia Threshold | 2000 mg/dL |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Specimen Stability
| Ambient | 5 days |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 30 days |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time | Routine: 4 hours |
| Stat Availability | No |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
84439
Last review/edit date
March 2024