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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



<!-- 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



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

Performance Information



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

CPT Codes

84540