Test Code 1013(test includes BUN and Creatinine)
Test Details
BUN/Creatinine Ratio
BUN/Creatinine Ratio is a calculation using blood (serum) urea nitrogen (BUN) and creatinine.
Methodology
BUN/Creatinine ratio is calculated as follows:
BUN divided by Creatinine
Patient Preparation
None
Preferred Specimen
Green Top Tube
(Lithium Heparin plasma separator tube with gel)
Alternate Specimen
Transport Temperature
Refrigerated (ship on frozen cold packs)
Stability
Refrigerated: 7 days
Lab Values
BUN/Creatinine Ratio
- Normal: ≤23
- Increased Risk: >23
Clinical Significance
BUN/Creatinine Ratio
- 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.
Treatment Options
BUN/Creatinine Ratio
- Identify etiology of elevated BUN and creatinine with physical assessment and additional diagnostic tests as indicated.
- Treatment is based on etiology of elevation.
