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FREE T3 Serum/Plasma
Test CodeFT3
CPT Codes
84481
Preferred Specimen
Light Green (Lithium) Gel or Gold Top Tube
Specimen Stability
7 days
Clinical Significance
In vitro diagnostic test for the quantitative measurement of Free Triiodothyronine in human serum. Measurement is useful when total T3 is altered due to changes in thyroid hormone binding proteins. Elevated levels are seen in hyperthyroidism.