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Test Code Fl Urea Fluid, Urea Nitrogen

Aliases

Fluid BUN

Patient Preparation

No special patient preparation required

Special Collection Instructions

Source must be noted

Collection Method

Sterile body fluid collection

Minimum Volume

  • Adults: 0.4 ml
  • Pediatric: 0.25 ml

Container

Sterile Urine Cup

Preferred Specimen

Sterile container

Acceptable Specimens

Body fluids

Reference or Target Ranges

No reference values available for body fluid sources

Reportable Units

mg/dL

Critical Value

Not defined for this assay

Reasons for Rejection

 


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Hemolysis Threshold 131 mg/dL
Icterus Threshold 20 mg/dL
Lipemia Threshold 500 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

 


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

Performance Information

 


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Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availabilty Yes
Performing Bench UH Chemistry
Methodology/Method Description Siemens Atellica – Colorimetric Assay

CPT Codes

84540