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HelpTest Code T3UP T3 (Triiodothyronine), Uptake, Serum
Performing Laboratory
Northwell Health Laboratories
Methodology
Electochemiluminescence
Includes calculation of free thyroxine (T4) index when T4 is also ordered.
Reference Values
% T3UP: 28-41%
Index: 0.80-1.30
FTI%: 1.3-4.9%
Test Classification and CPT Coding
84479
Specimen Required
Container/Tube: Gold-top tube(s)
Specimen: 1 mL of serum
Transport Temperature: Refrigerate
Day(s) and Time(s) Performed
Monday through Sunday
Computer Interface Code
PDM # 5300420