Free Thyroxine Index

Specimen Collection Information

Specimen	Minimum Test Volume	Container	Special Handling
Blood	0.1 ML

Refrigerated

Assay	Gender	Age Range	Normal Range	Critical Values	Units
FTI	All	0 Minutes – 150 Years	4.4 -11.4		mcg/dL

FTI cannot be ordered by itself. FTI will be automatically ordered when T4 and TUP are ordered together.

Assay Display	Interpretive Data
FTI	FTI Reference Interval (mcg/dL): Pregnant Females: First Trimester: 5.4-11.1 Second Trimester: 5.3-10.8 Third Trimester: 5.2-10.8

Monday through Sunday; continuously

Chemistry