Home
HelpTest Code T4FREE T4 (Thyroxine), Free, Serum
Performing Laboratory
North Ottawa Community Hospital
Specimen Requirements
Specimen Type: Serum
Container/Tube: Serum gel or red top
Specimen Volume: 1 mL
Collection Instructions: Avoid hemolysis and lipemia.
Reference Values
0.59-1.80 ng/dL
Day(s) Test Set Up
Monday through Sunday
Methodology
Competitive Immunoassay
Specimen Transport Temperature
Ambient
Test Classification and CPT Coding
84439
Specimen Storage and Stability
| Specimen Type | Temperature | Time |
| Serum | Room Temp | < 4 hours |
| Refrigerated (primary) | <7 days | |
| Frozen | <4 weeks |