Sign in →

Test Code LAB140 Urea Nitrogen (BUN), Plasma

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Colorimetric (Urease with Glutamate Dehydrogenase)

Literature Reference:

Package insert: Urea/BUN UREAL reagent. Roche Corporation, 12/2019.

Specimen Requirements

Note: This test is also available as part of #LAB17 Comprehensive Metabolic Panel (CMP), #LAB15 Basic Metabolic Panel (BMP), and #LAB19 Renal Function Panel.

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

Test Classification and CPT Coding

84520

Reference Values

0 minutes - 2 weeks: 2-24 mg/dL

> 2 weeks - 1 year: 3-20 mg/dL

> 1 year: 6-25 mg/dL

Literature Reference:

Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6th ed: Chapter 32, p. 479, Elsevier, St. Louis, MO 2018.

.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only

Alternate Tube(s):
1 dark green-top (lithium heparin) tube
1 plain, red-top tube
 

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. 

Test performed in South County Siteman and Ambulatory Cancer Building Lab.  Centrifuge sample and deliver to the Cobas.  Completed specimens are stored refrigerated for 5 days. 

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

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