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Test Code 1887 Urea Nitrogen (BUN), Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory


Colorimetric (Urease with Glutamate Dehydrogenase)

Literature Reference:

Package insert: Urea/BUN UREAL reagent. Roche Corporation, 03/2014.

Specimen Requirements

Note: This test is also available as part of #6961 Comprehensive Metabolic Panel (CMP), #6965 Hepatic Function Panel, and #6970 Renal Function Panel. See Common Panel Test Combinations in Special Instructions to avoid duplicate test requests when multiple panels are ordered.


Specimen Type: Plasma

Container/Tube: Mint-green top (lithium heparin)

Specimen Volume: Full tube


Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Reference Values

0-18 years: 9-18 mg/dL (diet dependent)

Adults: 8-25 mg/dL (diet dependent)

Literature Reference:

Tietz, Burtis CA, Ashwood ER, Bruns DE eds: Textbook of Clinical Chemistry and Molecular Diagnostics 5th ed: Chapter 25, p. 669, Elsevier, St. Louis, MO 2012.

Test Classification and CPT Coding


Additional Information

For BJH Laboratory Use Only

Alternate Tube(s):
1 dark green-top (lithium heparin) tube
1 plain, red-top tube
Analyte Stability: 
See Analyte Stability Chart in Special Instructions.

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days. 

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Urea Nitrogen 3094-0
Urea Nitrogen-post dialysis 11064-3
Urea Nitrogen-pre dialysis 11065-0