ARUP's Laboratory Test Directory

Urea Nitrogen, Serum or Plasma : 0020023

Mnemonic: BUN

Methodology: Spectrophotometry
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL plasma separator tube or serum separator tube.

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

Pediatric Collection/Transport:  0.2 mL plasma or serum at 2-8°C.

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

Unacceptable Conditions:  Specimens containing sodium fluoride.

Stability:  After separation from cells: Ambient: 24 hours; Refrigerated: 5 days; Frozen: 6 months
Reference Interval:
By report (reports may vary based on instrumentation)
CPT Code(s): 84520
 
 

 

 

 
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