Performed

Daily

Methodology

Urease / GLDH, Kinetic UV

Reported

Routine: 4 hours
Stat: 1 hour

Synonyms

  • Urea Nitrogen Blood Level
  • Blood Level, Urea Nitrogen
  • Urea Nitrogen Level
  • Blood Urea Nitrogen Concentration
  • BUN Level
  • BUN Concentration
  • Chemistry Laboratories

Performing Lab

Chemistry

Add-on Eligibility

Yes, within 7 days of collection
*Samples are stored for a maximum of 7 days

Specimen Type

Blood

Specimen Preparation

Blood specimens collected in Plasma Separator Tubes (PSTs) must be centrifuged within 2 hours of the collection time for optimal sample integrity.

Specimen Volume

6 mL (Minimum: 2 mL)
*This refers to specimen volume at collection prior to any processing

Collection Container

Lithium Heparin Plasma Separator Tube (Light Green Top Vacutainer)

Pediatric Collection

1 Lithium Heparin Microtainer (Light Green Top Microtainer)

Unacceptable Conditions

  1. Lipemic or grossly hemolyzed specimens
  2. Specimens containing particulate matter or exhibiting obvious microbial contamination
  3. Specimens that have been improperly collected, stored, or transported
  4. Specimens that have not been centrifuged within 2 hours of collection
  5. Unlabeled or mislabeled specimens

Storage/Transport Temperature

Transport Instructions    
Collection Location Transport Temperature Processing Required Timeframe
ED/Inpatient Room Temperature None Specimen must be received by the lab within 2 hours of collection
Refrigerated (Ice Packs) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Laboratory/
Outpatient/
Off-Site		 Room Temperature Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Refrigerated (Ice Packs) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Frozen (Dry Ice) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 1 year of collection

Storage: Refrigerated

Stability (from collection to initiation)

Stability:
Prior to separation from cells:
  • Room Temperature: 2 hours
After separation from cells:
  • Room Temperature: 7 days
  • Refrigerated: 7 days
  • Frozen at -20°C: 1 year

Laboratory Storage: Refrigerated
Laboratory Retention: 7 days

Collection Instructions

Labeling Instructions:
  1. When labeling blood tubes, leave a small window visible for the lab to assess the fill volume and sample integrity
  2. Ensure that the barcode is in the correct orientation

Collection Instructions:
  1. Follow the correct order of draw when collecting with additional orders and tube types:
     

Processing Instructions:
  1. Invert the collection tube according to the number of inversions in the chart above
  2. Centrifuge within 2 hours of collection

Reference Interval

BUN Reference Ranges  
Age Range
Infants (< 1 year) 4 - 19 mg/dL
Infants / Children (1 - 17 years) 5 - 18 mg/dL
Adults (18 - 60 years) 6 - 20 mg/dL
Adults (> 60 years) 8 - 23 mg/dL
Ordering

Performed

Daily

Methodology

Urease / GLDH, Kinetic UV

Reported

Routine: 4 hours
Stat: 1 hour

Synonyms

  • Urea Nitrogen Blood Level
  • Blood Level, Urea Nitrogen
  • Urea Nitrogen Level
  • Blood Urea Nitrogen Concentration
  • BUN Level
  • BUN Concentration
  • Chemistry Laboratories

Performing Lab

Chemistry

Add-on Eligibility

Yes, within 7 days of collection
*Samples are stored for a maximum of 7 days
Collection

Specimen Type

Blood

Specimen Preparation

Blood specimens collected in Plasma Separator Tubes (PSTs) must be centrifuged within 2 hours of the collection time for optimal sample integrity.

Specimen Volume

6 mL (Minimum: 2 mL)
*This refers to specimen volume at collection prior to any processing

Collection Container

Lithium Heparin Plasma Separator Tube (Light Green Top Vacutainer)

Pediatric Collection

1 Lithium Heparin Microtainer (Light Green Top Microtainer)

Unacceptable Conditions

  1. Lipemic or grossly hemolyzed specimens
  2. Specimens containing particulate matter or exhibiting obvious microbial contamination
  3. Specimens that have been improperly collected, stored, or transported
  4. Specimens that have not been centrifuged within 2 hours of collection
  5. Unlabeled or mislabeled specimens

Storage/Transport Temperature

Transport Instructions    
Collection Location Transport Temperature Processing Required Timeframe
ED/Inpatient Room Temperature None Specimen must be received by the lab within 2 hours of collection
Refrigerated (Ice Packs) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Laboratory/
Outpatient/
Off-Site		 Room Temperature Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Refrigerated (Ice Packs) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 7 days of collection
Frozen (Dry Ice) Centrifuge to separate from cells within 2 hours of collection Specimen must be received by the lab within 1 year of collection

Storage: Refrigerated

Stability (from collection to initiation)

Stability:
Prior to separation from cells:
  • Room Temperature: 2 hours
After separation from cells:
  • Room Temperature: 7 days
  • Refrigerated: 7 days
  • Frozen at -20°C: 1 year

Laboratory Storage: Refrigerated
Laboratory Retention: 7 days

Collection Instructions

Labeling Instructions:
  1. When labeling blood tubes, leave a small window visible for the lab to assess the fill volume and sample integrity
  2. Ensure that the barcode is in the correct orientation

Collection Instructions:
  1. Follow the correct order of draw when collecting with additional orders and tube types:
     

Processing Instructions:
  1. Invert the collection tube according to the number of inversions in the chart above
  2. Centrifuge within 2 hours of collection
Result Interpretation

Reference Interval

BUN Reference Ranges  
Age Range
Infants (< 1 year) 4 - 19 mg/dL
Infants / Children (1 - 17 years) 5 - 18 mg/dL
Adults (18 - 60 years) 6 - 20 mg/dL
Adults (> 60 years) 8 - 23 mg/dL

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