USC ENDOCRINE LABORATORIES

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TEST INDEX

Thyroglobulin (Tg) Tg Antibody TSH Free T4 Total T4 Free T3 Total T3 TPO Antibody
THBR FT4I or FT3I


FREE THYROXINE INDEX (FT4I)

Methodology  This is not a test per-se.  It is a calculated ratio of two tests: Total T4 / THBR

Performed  Tue, Fri

Reported  Same day

Remarks  FT4-Index Components: Thyroxine (T4), Thyroid Hormone Binding Ratio (THBR)

CPT Code(s)  84436 (T4), 84479 (THBR)

Reference Range  4.5 – 12.5 (no units)


FREE TRIIODOTHYRONINE INDEX (FT3I)

Methodology  This is not a test per-se.  It is a calculated ratio of two tests: Total T3 / THBR

Performed  Tue, Fri

Reported  Same day

Remarks  FT3-Index Components: Triiodothyronine (T3), Thyroid Hormone Binding Ratio (THBR)

CPT Code(s)  84480 (T3), 84479 (THBR)

Reference Range  80 – 180 (no units)

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