Home
HelpCatalog ID Fr T4 T4 (Thyroxine), Free
CPOE Test Name
Thyroxine Free; T4 Free
Synonyms
Fr T4; Unbound T4; Free Thyroxine
Specimen Type
Serum
Specimen Requirements
5 mL gold top SST tube; 2 mL blood minimum
Reference Values
0.58-1.76 ng/dL
Causes for Rejection
Improper tube; insufficient volume; improper labeling
Turn Around Time
Routine: 2 – 4 hrs. Urgent/Emergent: 1 hr.
CPT / HCPCS Code
84439
Performing Lab
Core Laboratory, AD 3301 721-2120