ARUP's Laboratory Test Directory

T3 Uptake : 0070135

Mnemonic: T3 UP

Methodology: Quantitative Electrochemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Serum separator tube. Also acceptable: Plasma separator tube, lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin).

Specimen Preparation: Allow serum to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Grossly hemolyzed specimens.

Stability (collection to initiation of testing): After separation of cells: Ambient: 24 hours; Refrigerated: 8 days; Frozen: 3 months
Reference Interval:
28-41% uptake
Interpretive Data: Thyroxine, Free (Free T4) (0070138) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests.
Note: T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index.
CPT Code(s): 84479
 
 

 

 

 
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