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Urea Nitrogen (BUN) : 294
Test CodeBUNAU or 294
Alias/See Also
Blood Urea Nitrogen, BUN
CPT Codes
84520
Transport Container
Preferred Specimen
1 mL serum
Alternative Specimens
Sodium heparin (green-top) tube or Lithium heparin (green-top) tube
Minimum Volume
0.5 mL
1 mL serum
Alternative Specimens
Sodium heparin (green-top) tube or Lithium heparin (green-top) tube
Minimum Volume
0.5 mL
Transport Temperature
Room temperature.
Specimen Stability
Room temperature: 7 days; Refrigerated: 5 days; Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Anticoagulants other than heparin
Methodology
Spectrophotometry
Setup Schedule
Sunday - Saturday
Report Available
1 day
Reference Range
Male (mg/dL) Female (mg/dL)
<1 Month 4-12 3-17
1-11 Months 2-13 4-14
1-3 Years 3-12 3-14
4-19 Years 7-20 7-20
≥20 Years 7-25 7-25
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 occur primarily in advanced liver disease and in overhydration.
Performing Laboratory
med fusion