Thyroid Profile

CPT Test code: 84436;84479

Related Documents:	Thyroid Cascade Testing: Differential Laboratory Diagnosis of Thyroid Function
Test Includes:	Free thyroxine index; T₃ uptake (THBR); thyroxine (T₄)
Specimen:	Serum
Volume:	1 mL
Minimum Volume:	0.5 mL (Note: This volume does not allow for repeat testing.)
Container:	Red-top tube or gel-barrier tube
Collection:	If a red-top tube is used, transfer separated serum to a plastic transport tube.
Storage Instructions:	Refrigerate
Use:	FTI is a physiologic index of metabolic activity that correlates with free thyroxine (T₄)