USC Clinical Reference Laboratory

FREE THYROXINE INDEX

METHODOLOGY

Electrochemiluminescence Immunoassay

PERFORMED

Mon-Fri

REPORTED

Same day

COLLECT

One 6 mL SST (Min: 4 mL SST)

TRANSPORT

1 mL refrigerated serum (Min: 0.3 mL)

STABILITY

Refrigerated - 48 hours
Frozen - Stable

UNACCEPTABLE CONDITIONS

N/A

REMARKS

N/A

REFERENCE RANGE

4.5 - 12.5 Free Thyroxine Index components:
Thryoxine, Thyroid Hormone Binding Ratio

INTERPRETIVE DATA

N/A

CPT CODE(S)

80091

BILLING INFORMATION

ICD-9 (Dx) CODE INFORMATION

DATE UPDATED

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