ARUP's Laboratory Test Directory

T3 Uptake : 0070135

Mnemonic: T3 UP

Methodology: Electrochemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube.  Also acceptable: One 4 mL plasma separator tube, one 3 mL lavender (EDTA), pink (K2 EDTA), or green (sodium or lithium heparin).

Transport:  1 mL serum or plasma at 2-8°C.  (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube.

Remarks:  Allow serum to clot completely at room temperature.  Separate serum or plasma from cells ASAP.

Unacceptable Conditions:  Grossly hemolyzed specimens.

Stability:  After separation of cells: Ambient: 24 hours; Refrigerated: 8 days; Frozen: 3 months
Reference Interval:
28-41% uptake
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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