T Uptake (Thyroxine Binding Capacity)

Synonyms

  • LAB135
  • T3 UPTAKE
  • T3, UPTAKE
  • T4 UPTAKE
  • THBR
  • THYROID BINDING RATIO

Cerner Name

T Uptake

Clinical Info

Specimen Sources

Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

Blood

Specimen Volume

1 mL of serum

Container

Gold Top Tube

Collection Instructions

Container/Tube: Gold-top tube(s)
Specimen: 1 mL of serum

Transport Instructions

Refrigerate

Specimen Stability

8 Days Room Temperature
14 Days Refrigerated
24 Months Frozen

Methodology

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

Days Performed

Monday through Sunday, Continuously

Performing Laboratories

Northwell Health Laboratories

CPT

84479

PDM

5300420

Results
Component Name Base Name Common Name External Name
T3 UPTAKE T3U T3 UPTAKE T-Uptake

Result Interpretation

T3UP:             0.8-1.3  TBI Units
%T3UP:          28-41    %
FTI:                 4.4-11.4 Index
%FTI:              1.4 - 4.8    %

Forms
Endocrine LAB135 build edit