Triiodothyronine (T3) Uptake


Sunquest Code:T3UPT  
Epic Code:LAB135Epic Name:T3 UPTAKE
Synonyms:Thyroid Binding Ratio. Order Free T4 and T3 Uptake.; T3 Uptake
Methodology:Electrochemiluminescence immunoassay
CPT Code:84479
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1 day.


Collection Instructions

Specimen:Blood
Optimal Volume:2 mL
Minimum\Peds Volume:1.2 mL
Container:Red or gold (gel) (Green (lithium heparin, gel), Green (sodium heparin, no gel), Purple (EDTA), Red (no gel))
Causes for Rejection:Gross hemolysis


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1 mL, 0.5 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:70135 (T3 UP)


Interpretive

Reference Range:28-41% uptake
Use:T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index.


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