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HelpTest Code LAB126 Total T4
AKA
Thyroxine
Specimen Type/Requirements
Gold top (Serum w/gel) tube - Serum
Red top (Serum w/out gel) tube - Serum
Light Green top (Lithium Heparin w/gel) tube - Plasma
Note: If testing will be delayed more than 24 hours, remove serum or plasma from the clot, red blood cells, or separator gel.
Test is affected by moderate hemolysis and gross lipemia.
Specimen Volume
| Preferred Volume | 1.0 mL |
|---|---|
| Minimum Volume | 0.4 mL |
Stability/Transport
| Room Temperature | 8 hours | |
|---|---|---|
| Refrigerated | 6 days | Preferred for transport |
| Frozen | Greater than 6 days |
Performed Test Frequency
Monday through Sunday
Methodology
Chemiluminescence
CPT
84436
Performing Lab
Sanford Laboratories Sioux Falls