Days Set Up
Daily, 24 hours
Analytic Time
4 hours
MiChart Code
T3 Uptake and FTI
Soft Order Code
T3U
Test Updated:
Synonyms
Free Thyroxine Index
FTI
T7
Thyroxine Index, Free
Triiodothyronine Uptake
T3U
FREE THYROXINE INDEX
T3 UPTAKE
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Test Overview
Test Methodology
Competitive Immunoassay
Test Usage
Thyroid function test, for the diagnosis of hypothyroidism or hyperthyroidism in conjunction with T4 result.
Reference Range
22 - 37% Uptake
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Billing Information
CPT Code
84479
Pro Fee Code
LOINC
3050-2