Home
HelpTest Code LAB137 Free T3
Useful For
- Monitoring thyroid hormone replacement therapy
- Evaluating clinically euthyroid patients who have an altered distribution of binding proteins
Methodology
Electrochemiluminescence Immunoassay (ECLIA)
Performing Laboratory
Bozeman Health Laboratory Services
Specimen Requirements
Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL
Specimen Transport Temperature
Ambient/Refrigerated
Specimen Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma or Serum | Ambient | 5 days |
| Refrigerated | 7 days | |
| Frozen | 1 month |
Reference Values
0 - 30 days: 2.0 - 5.2 pg/mL
30 days - 1 year: 1.5 - 6.4 pg/mL
1 year - 6 years: 2.0 - 6.0 pg/mL
6 years - 11 years: 2.7 - 5.2 pg/mL
11 years - 19 years: 2.3 - 5.0 pg/mL
19 years and older: 2.0 - 4.4 pg/mL
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84481