|Alternate:||BUN; Blood Urea Nitrogen|
|Available:||Daily, 24 hours|
|Turnaround:||Routine: 3 hours, STAT: 30 minutes|
|Container:||3 mL green top tube or green microtainer (sodium heparin)|
|Temperature:||Transport to lab within 30 minutes of collection.|
|Uses:||High BUN levels occur in glomerulonephritis, pyelonephritis, and other causes of renal disease and with shock, dehydration, ketacidosis. Low levels occur in normal pregnancy, decreased protein intake, and excessive IV fluids and liver disease.|
|Method:||Enzymatic biochromatic rate (NAD/NADH)|
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