bun/creatinine ratio
Kidney FunctionBlood sampleEst. 24h
BUN/Creatinine Ratio
Compares BUN and creatinine to support kidney function interpretation.
Sample
Blood
Results
Est. 24h
Prep
Check details
Follow-up
Optional add-on
What this test detects
When to get this test
How to prepare
01
No fasting required unless this test is booked with other tests that require fasting.
02
Drink water normally unless advised otherwise.
Common questions
What does the BUN/creatinine ratio compare?
It compares two waste products in the blood, blood urea nitrogen (BUN) and creatinine. The ratio is BUN divided by creatinine. Both are filtered by the kidneys, so doctors read them together rather than alone.
Why would a doctor order a BUN/creatinine ratio?
A doctor may use it alongside other kidney tests to help understand your results. It is one piece of information, and only a doctor can tell you what yours means. A ratio outside the usual range does not diagnose anything on its own.