Triiodothyronine (T3) Uptake

Abbrev Code:T3UPT   
Order Code:LAB135Order Name:T3 Uptake
Synonyms:Thyroid Binding Ratio. Order Free T4 and T3 Uptake.; T3 Uptake
Methodology:Electrochemiluminescence immunoassay
CPT Codes: 84479 x1
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1 day.

Collection Instructions

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

Processing and Shipping

Specimen Processing:Within 2 hours of collection, 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


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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