BUN (BUN)

Department: Chemistry
Test Synonym(s): LAB140, BUN, Urea Nitrogen Blood, Blood Urea Nitrogen
CPT Codes: 84520
Methodology: Urease
Reference Range: 0-<15 days: 3-22 mg/dL; 15 days-<1yr: 4-17 mg/dL; 1-<10 yrs: 9-22 mg/dL; 10-<19 yrs: 7-20 mg/dL; 19-<50 yrs: 7.0-21 mg/dL; 50-150 yrs: 8-26 mg/dL (Pediatric Reference Ranges only verified for serum, see CALIPER Study in Colantonio DA, et.al Clin Chem 2012;58(5):854-868.)
Tube Type: Light green top PST (Lithium Heparin with gel)
Specimen: Plasma
Alternate Specimen: Red top (no gel)
Pediatric Requirements: 1 light green top microtainer
Volume: 2 mL plasma
Minimum Volume: 1 light green top
Temperature: Separate within 1 hour and store/ship @ ambient temperature until delivery.
Stability: Room temperature: 7 days; Refrigerated: 7 days; Frozen: 1 year
Reasons for Rejection: Hemolysis; improper collection
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab

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