USC Clinical Reference Laboratory

FREE THYROXINE INDEX (FT4INDEX)

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 (T4), Thyroid Hormone Binding Ratio (THBR)

INTERPRETIVE DATA

N/A

CPT CODE(S)

84436

BILLING INFORMATION

ICD-9 (Dx) CODE INFORMATION

DATE UPDATED

| | | | | |