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 TBG Calcitonin PTH


FREE THYROXINE INDEX (FT4I)

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

Performed  Mon - Fri

Reported  Mon - Fri

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  Mon - Fri

Reported  Mon - Fri

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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