3 doctors weighed in:

What does an elevated bun/creatinine ratio mean?

3 doctors weighed in
Dr. Peter Kurzweil
Internal Medicine
2 doctors agree

In brief: Decrease in flow.

Bun=blood urea nitrogen, byproduct of proteins ingested, if rise to high levels due to kidney problem, can cause toxic affects on the body.
Creatinine= measurement of renal function. Normal bun/cr ratio about 10. The higher that ratio, the more likely it is not intrinsic kidney disease per se, but reduction in blood flow or volume to kidney, like when on strong diuretic-prerenal-reversible.

In brief: Decrease in flow.

Bun=blood urea nitrogen, byproduct of proteins ingested, if rise to high levels due to kidney problem, can cause toxic affects on the body.
Creatinine= measurement of renal function. Normal bun/cr ratio about 10. The higher that ratio, the more likely it is not intrinsic kidney disease per se, but reduction in blood flow or volume to kidney, like when on strong diuretic-prerenal-reversible.
Dr. Peter Kurzweil
Dr. Peter Kurzweil
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1 comment
Dr. Ed Friedlander
Dr. Kurzwell is correct. And just eating some extra protein, like a nice steak dinner, will raise your BUN/creatinine ratio. This is one more reason not to get all worked up over your labs -- they're there if you're sick, but most minor variations are of no importance if you feel well.
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