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- Test Details
- Lab Values
- Clinical Significance
- Treatment Options
BUN/Creatinine Ratio is a calculation using blood (serum) urea nitrogen (BUN) and creatinine.
BUN/Creatinine ratio is calculated as follows:
BUN divided by Creatinine
1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST/Tiger Top)
1.0 mL EDTA plasma (0.5 mL minimum) collected in plasma separator tube (Pearl Top)
Refrigerated (ship on frozen cold packs)
Refrigerated: 7 days
- Normal: ≤23
- Increased Risk: >23
- An elevated BUN/Creatinine ratio may be present with dehydration or in acute or chronic renal disease, reduced renal perfusion, or urinary tract obstruction.
- Increased urea production may also elevate the ratio.
- Identify etiology of elevated BUN and creatinine with physical assessment and additional diagnostic tests as indicated.
- Treatment is based on etiology of elevation.