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Test Code T3UP T3 (Triiodothyronine), Uptake, Serum

Performing Laboratory

Northwell Health Laboratories

Methodology

Electrochemiluminescence Immunoassay (ECLIA)

Includes calculation of free thyroxine (T4) index when T4 is also ordered.

Reference Values

T3UP:             0.8-1.3  TBI Units

%T3UP:          28-41    %

FTI:                 4.4-11.4 Index

%FTI:              1.4 - 4.8    %

Test Classification and CPT Coding

84479

Specimen Required

Container/Tube: Gold-top tube(s)

Specimen: 1 mL of serum

Transport Temperature: Refrigerate

Stability:  8 Days Room Temperature

                14 Days Refrigerated

               24 Months Frozen

Day(s) and Time(s) Performed

Monday through Sunday, Continuously

Computer Interface Code

PDM #  5300420