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Test Code BUN Blood Urea Nitrogen

Aliases

Urea

Patient Preparation

No special patient preparation required

Collection Method

Venous collection

Minimum Volume

  • Adults: 0.8ml
  • Pediatric: 0.5mL

Container

Lt Green / Plasma Separator / Lithium Heparin

Preferred Specimen

Light Green Top (lithium heparin) plasma

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top

Plasma:

  • Light Geen Top (lithium heparin)

 

Reference or Target Ranges

0 – 1 year 4 – 19 mg/dL
1 year – 18 years 5 – 18 mg/dL
18 years – 60 years 6 – 20 mg/dL
>60 years 8 – 23 mg/dL

Reportable Units

mg/dL

Critical Value

≥80 mg/dL

Reasons for Rejection

 

Hemolysis Threshold 1000 mg/dL
Icterus Threshold 60 mg/dL
Lipemia Threshold 1000 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

 

Ambient 7 days
Refrigerated (4°C to 8°C) 7 days
Frozen(-40°C to 0°C) 1 year

Performance Information

 

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availability Yes
Performing Bench UH Chemistry, WCH Chemistry
Methodology/Method Description Roche Cobas – NADH absorbance assay

CPT Codes

84520