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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. Test performed in North Campus Laboratory. Centrifuge upon receipt and deliver to the Modular. 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