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Epic Code LAB140 Blood Urea Nitrogen (BUN)

Test Name Alias

Urea Nitrogen Blood Level | BUN | Blood Urea Nitrogen | 8344 | 1230101255

Interface Order Alias

10019

Collection Instructions

Specimen Collection: Blood

 

Container(s): Gold Top (Serum Separator-SST Gel) or Light Green Top (Lithium Heparin Gel)

Minimum Volume to Collect: 1.0 mL

Neonate Volume to Collect: 0.4 mL

Capillary collect ok? Yes

Microtainer acceptable: Yes

 

Collection Instructions:

  • After collection, gently invert tube 8-10 times.
  • Specimen should be processed within 2 hours See Processing Instructions.

 

Processing Instructions (Laboratory, Outpatient or Off-site collection)

Processed Specimen: Serum or Plasma

Centrifuge/Spin: Yes

Aliquot: Yes

 

Processing Instructions:

  • Serum is preferred specimen type
  • Green Tube/Plasma: Centrifuge after collection.
  • Gold Tube/Serum: Allow blood to clot for 30 minutes in a vertical position and centrifuge within 2 hours.

Transport Temperature: Refrigerate

Specimen Transport Temperature

Refrigerate

Specimen Stability

Ambient: 8 hours

Refrigerate: 72 hours

Frozen: aliquot plasma/serum for longer storage

Laboratory Retention: 72 hours

Test Frequency

Available 24 hours, usual TAT 1 day.

Reference Range

AGE CHW CHS
0 up to 3 Months 4-16 mg/dL 4-19 mg/dL
3 Months up to 1 Years 6-18 mg/dL 4-19 mg/dL
1 Years up to 16 Years 6-18 mg/dL 5-18 mg/dL
16 Years up to 19 Years 8-20 mg/dL 5-18 mg/dL
19 Years up to 61 Years 8-20 mg/dL 6-20 mg/dL
61 Years up to Unspecified 8-20 mg/dL 8-23 mg/dL

Laboratory Critical Values Table

Performing Department

Chemistry

Performing Department Laboratory Location

CHW

Corewell Health Reference Laboratory, Grand Rapids, MI
Corewell Health Big Rapids Laboratory, Big Rapids, MI
Corewell Health Blodgett Laboratory, Grand Rapids, MI
Corewell Health Gerber Laboratory, Fremont, MI
Corewell Health Greenville Laboratory, Greenville, MI
Corewell Health Ludington Laboratory, Ludington, MI
Corewell Health Pennock Laboratory, Hastings, MI
Corewell Health Reed City Laboratory, Reed City, MI
Corewell Health Zeeland Laboratory, Zeeland, MI

 

CHS

Corewell Health Lakeland St. Joseph Laboratory, St. Joseph, MI
Corewell Health Lakeland Niles Laboratory, Niles, MI
Corewell Health Watervliet Laboratory, Watervliet, MI

Corewell Health Lakeland Marie Yeager Cancer Center, St. Joseph, MI

Methodology

Urease/Glutamate Dehydrogenase (GLDH)

CPT

84520

CDM Code

3018452001

Epic Test ID

1230101255

LOINC

Urea Nitrogen: 3094-0

Reviewed Date

3/7/2024

Updated Date

4/25/2025 - CHS info added

12/2/2025 - Gold Top Preferred specimen

Orderable Regions

Southwest; West