Test Code T4FREE T4 Free
Specimen Requirements
Container/Tube: RED/SST
Preferred: Serum
Acceptable: Serum Only
Specimen Volume: 1.0 mL
TRANSPORT TEMPERATURE
Processed samples may be refrigerated at 2–8 °C for 14 days if not tested within 24 hours. For longer storage, serum samples may be frozen at -20 °C for three months.
PERFORMING LAB
WKMC, WKB, WKP, WKS