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Urea nitrogen
Test CodeUREA NITROGEN
Alias/See Also
BUN
Chemistry
Chemistry
Preferred Specimen
Light Green Top Tube -Plasma
Other Acceptable Specimens
Gold Top Tube
Transport Temperature
Refrigerate
Specimen Stability
Room temperature: 7 days
Refrigerated (2-8°C): 7 days
Frozen (-20°C or colder): 1 year
Refrigerated (2-8°C): 7 days
Frozen (-20°C or colder): 1 year
Methodology
Urease
Setup Schedule
Daily
Report Available
TAT 1 day
Reference Range
7-25 mg/dL
Clinical Significance
Urea is the principle waste product of protein catabolism. BUN is most commonly measured in the diagnosis and treatment of certain renal and metabolic diseases. Increased BUN concentration may result from increased production of urea, due to (1) diet or excessive destruction of cellular proteins as occurs in massive infection and fevers; (2) reduced renal perfusion resulting from dehydration or heart failure; (3) nearly all types of kidney disease, and (4) mechanical obstruction to urine excretion such as is caused by stones, tumors, infection, or stricture. Decreased urea levels are less frequent and occurs primarily in advanced liver disease and in overhydration.
Performing Laboratory
Test performed in BACL Chemistry Labs
Contact: Jonathan Dryjowicz-Burek, West Roxbury 857-203-5973
Alternate contact Joseph A. Manzone JP 857-364-5092
Alternate contact Diane Robert BR 774-826-2294
Alternate contact Bhumikaben Patel Bedford 781-275-2976
Last Updated: May 17, 2022
