Bun/Creatinine Ratio

You should get a BUN/creatinine ratio test if your BUN or creatinine levels are abnormal, or if you have reduced urine output, swelling, fatigue, nausea, confusion, or signs of dehydration. It is also recommended for people with kidney disease, heart failure, GI bleeding, diabetes, or high blood pressure, and for monitoring kidney function.

Fasting for 8–12 hours is usually recommended before a BUN/creatinine ratio test, and you may drink water during this time. Avoid a heavy meat or high-protein meal, alcohol, and strenuous exercise for 24 hours beforehand, as these can affect results. Stay well hydrated, and inform your doctor about medicines like diuretics, steroids, or painkillers.

Yes, fasting is usually recommended for a BUN/creatinine ratio test. You should fast for 8–12 hours before giving your sample, though drinking water is allowed. Also avoid heavy meat or high-protein meals, alcohol, and strenuous exercise for 24 hours beforehand, as they can affect BUN and creatinine results.