ARUP's Laboratory Test Directory

Urea Nitrogen, Serum or Plasma : 0020023

Mnemonic: BUN

Methodology: Quantitative Spectrophotometry
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Plasma separator tube or serum separator tube.

Specimen Preparation: Allow specimen 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: 0.2 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Specimens containing sodium fluoride.

Stability (collection to initiation of testing): After separation from cells: Ambient: 48 hours; Refrigerated: 1 week; Frozen: 1 year
Reference Interval:
By report (reports may vary based on instrumentation)
CPT Code(s): 84520
Cross References: Blood Urea Nitrogen (Urea Nitrogen, Serum or Plasma), BUN (Urea Nitrogen, Serum or Plasma)