Definition
What BUN/Creatinine Ratio measures
The BUN/creatinine ratio divides blood urea nitrogen by creatinine from the same draw. It is calculated, not a new assay.
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Kidney & electrolytesEssentialCompleteratio
BUN/Creatinine Ratio
A hydration and protein-load clue from two kidney markers
Illustrative sample band · Synthetic
16ratio
6.7Sample target 10–20 ratio25
Why it matters
How clinicians usually read it
A higher ratio can hint at dehydration or extra protein load; a lower one can hint at low protein intake or other kidney patterns. The raw creatinine and eGFR still lead.
When it reads low
A lower value can mean
A lower ratio can follow low protein intake or a rise in creatinine relative to urea. It is a prompt, not a diagnosis.
When it reads high
A higher value can mean
A higher ratio often appears with a short-term fluid deficit or a high-protein stretch. Confirm how you felt and what you ate before the draw.
Questions for a clinician
Bring the number into a real conversation
01
Could I have been dry the morning of the draw?
02
Does the raw creatinine worry you more than this ratio?
03
What would you want the pair to do on the next test?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for BUN/Creatinine Ratio.