BUN/Creatinine Ratio — What It Means in Your Blood Test
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This ratio compares two kidney waste markers to help show what pattern of kidney strain you may have.
Your BUN/Creatinine Ratio lines up two waste markers so their relationship stands out. That comparison hints at which kind of strain may be behind a shift.
Also known as: BUN:Creatinine Ratio, Blood Urea Nitrogen to Creatinine Ratio, B/C Ratio, Urea/Creatinine Ratio
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What is BUN/Creatinine Ratio?
The BUN/creatinine ratio compares blood urea nitrogen, a value based on urea, with creatinine. It helps show the pattern behind kidney strain.
Why is BUN/Creatinine Ratio tested?
You have this test to help show whether raised kidney markers point to a fluid or blood flow issue. It helps tell that apart from a problem in the kidneys themselves.
What is a normal BUN/Creatinine Ratio range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- 10:1–20:1
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [KDIGO, 2024]
What does your BUN/Creatinine Ratio value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high BUN/Creatinine Ratio result mean?
A high ratio can mean less blood reaching your kidneys, more protein breakdown, or bleeding in the gut. It is worth discussing with your doctor.
What does a low BUN/Creatinine Ratio result mean?
A low ratio can go with low protein intake, liver disease making less urea, or muscle breakdown raising creatinine.
What can affect your BUN/Creatinine Ratio result?
- Protein in your diet
- Hydration
- Blood flow to your kidneys
- Liver urea making
- Muscle mass
Questions to ask your doctor
About this result
- What does my BUN/Creatinine Ratio result mean for me specifically, given my age and health?
- Is my BUN/Creatinine Ratio in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my kidney stress pattern ratio result?
- Is there anything I should do about my BUN/Creatinine Ratio, or is it fine to leave as it is?
About retesting
- Does my BUN/Creatinine Ratio need to be repeated, and if so, when?
- The typical range for BUN/Creatinine Ratio can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my BUN/Creatinine Ratio be looked at together with my Creatinine and Urea result?
- Does my BUN/Creatinine Ratio connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is BUN/Creatinine Ratio?
- The BUN/creatinine ratio compares blood urea nitrogen, a value based on urea, with creatinine. It helps show the pattern behind kidney strain. You have this test to help show whether raised kidney markers point to a fluid or blood flow issue. It helps tell that apart from a problem in the kidneys themselves.
- What is a normal kidney stress pattern ratio range?
- A typical adult range is around 10:1–20:1. No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high BUN/Creatinine Ratio result mean?
- A high ratio can mean less blood reaching your kidneys, more protein breakdown, or bleeding in the gut. It is worth discussing with your doctor.
- What does a low BUN/Creatinine Ratio result mean?
- A low ratio can go with low protein intake, liver disease making less urea, or muscle breakdown raising creatinine.
- What can affect your BUN/Creatinine Ratio result?
- Several everyday factors can influence it, including Protein in your diet, Hydration, Blood flow to your kidneys, Liver urea making, Muscle mass.
Sources
- KDIGO (2024) — KDIGO 2024 Clinical Practice Guideline for Acute Kidney Injury
Part of the Kidney Function
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