BUN/Creatinine Ratio — What It Means in Your Blood Test
New to reading lab reports? Start with our guide to reading a blood test report
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 does BUN/Creatinine Ratio do in your body?
Setting two waste markers side by side lets their relationship, not just their size, come through. That pattern can hint at whether too little fluid or blood reaching the kidneys is at play, rather than the kidneys alone. It is a pointer your care team weighs beside the separate values [KDIGO, 2024].
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
Related tests in this panel
Related reading
Check your BUN/Creatinine Ratio
Upload your report to see your BUN/Creatinine Ratio explained for you.
Upload your report