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Doctor insights on: Bun To Creatinine Ratio Calculator

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Dr. Madhu Kandarpa
2,203 doctors shared insights

Creatinine (Definition)

Creatinine is a byproduct of creatine phosphate, which is present in muscles. Creatinine levels increase if the ...Read more


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My bun to creatinine ratio is 5.7 to 1. What does this mean? Is this a cause for concern? My bun is 6.95 mg/dl and my creatinine is 1.29 mg/dl.

My bun to creatinine ratio is 5.7 to 1.  What does this mean? Is this a cause for concern? My bun is 6.95 mg/dl and my creatinine is 1.29 mg/dl.

Depends: Normal serum creatinine ranges from 0.7- 1.5 mg /dl in many labs, however one should review the normal range in their lab report. BUN ranges from 6 to 20 mg/dl. High serum creatinine and BUN generally indicate kidney damage.Your labs are normal, however review the lab report with md. ...Read more

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What means an elevated BUN to creatinine ratio of 24 if both BUN and Creatinine are individually normal? BUN: 17.7, Creat: 0,75. Take many fluids.Txs

What means an elevated BUN to creatinine ratio of 24 if both BUN and Creatinine are individually normal? BUN: 17.7, Creat: 0,75. Take many fluids.Txs

Elevated ratio: Hi Oskcar. You lab levels are normal and your ratio is high due to your low creatinine level. If you had a high BUN-creatinine ratio that was abnormal due to dehydration, your serum sodium and chloride would be high. You did not mention those values in your test results. Were they elevated? If not, you need not worry, if they were, ingest more fluids to reduce them and lower your ratio. ...Read more

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Meaning of bun/creatinine ratio?

Meaning of  bun/creatinine ratio?

Defines kidney prob: 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. ...Read more

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What causes elevated bun/creatinine ratio?

What causes elevated bun/creatinine ratio?

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. ...Read more

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What causes elevated bun/creatinine ratio?

What causes  elevated bun/creatinine ratio?

Many causes: Blood tests called BUN (blood urea nitrogen) and cr (creatinine) are often checked to help evaluate kidney function. The normal bun/cr ration is about 10:1 to 15:1. Some of the more common causes of an elevated bun/cr ratio are: dehydration, GI bleeding, increased protein intake, small amount of muscle mass, increased muscle breakdown. ...Read more

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What causes an elevated bun/creatinine ratio?

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. ...Read more

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What's the meaning of high bun/creatinine ratio?

See below: An elevated BUN with normal creatinine and a ratio of [generally more than 18-20] occurs most commonly in dehydrated individuals and is not a sign of kidney damage.It may also occur in in certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids. ...Read more

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What means bun/creatinine ratio and elevated alt?

Renal and liver test: Alt-liver enzyme-c priors. 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 kidney disease per se, but reduction in blood flow or volume to kidney, like when on strong diuretic-prerenal. ...Read more

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How can the bun/creatinine ratio show dehydration?

How can the bun/creatinine ratio show dehydration?

BUN/Cr > 20:1: Urea (BUN) is reabsorbed by the kidney; creatinine is not. In dehydration, as water decreases and urea is reabsorbed, the BUN rises. Eventually, the cr will rise, too (if dehydration continues), but it doesn't increase in magnitude as fast as the bun. The bun/cr ration is usually ~10:1...When it's greater than 20:1, this suggests dehydration. ...Read more

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How can the bun/creatinine ratio indicate dehydration?

May be helpful: There are many causes of an elevated BUN or elevated creatinine, and the ratio between them must be interpreted in the clinical context of each specific patient. What is commonly referred to as "dehydration" usually causes an increase in the BUN to creatinine ratio, but other significant conditions may cause a similar rise and need to be considered, especially if there is an acute illness involved. ...Read more

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How can the bun/creatinine ratio tell you have dehydration?

How can the bun/creatinine ratio tell you have dehydration?

See below: An elevated BUN with normal creatinine and a ratio of [generally more than 18-20] occurs most commonly in dehydrated individuals and is not a sign of kidney damage.It may also occur in in certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids. ...Read more

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On a metabolic workup, what does a low bun/creatinine ratio reading mean?

Maybe, kidney diseas: In prior answers, explained bun, creatinine, normal ratio, and high ratio. Low ratio means that the BUN is likely low or normal with relation to the creatinine, indicating that there is adequate blood or volume flowing to the kidneys, but the kidneys are impaired or disease in some way. Need a nephrologist - kidney specialist. ...Read more

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How does the bun/creatinine ratio show whether or not you have dehydration?

How does the bun/creatinine ratio show whether or not you have dehydration?

BUN/Creatinine ratio: Blood urea nitrogen (BUN) is the breakdown of protein excreted via kidney. Creatinine is the muscle breakdown product also excreted by the kidney. BUN and creatinine can be measured by lab tests. Usually the BUN / creatinine ratio has to to be over 20 for a patient to be considered dehydrated or in "pre renal kidney failure. ...Read more

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During a metabolic workup, what does a high bun/creatinine ratio reading mean?

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. ...Read more

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I'm a 69 year old female - my BUN/creatinine ratio is 29. Should I be concerned?

I'm a 69 year old female - my BUN/creatinine ratio is 29.  Should I be concerned?

No: if both value are basically normal or just a bit up at your age, you are fine. You can get a ratio like that from eating a big steak. The ratio is useful only if other labs are abnormal and the person is obviously sick. ...Read more

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My 2007 med record says: glucose 104, bun 25, creatinine 1.5, bun/creat ratio 17, egfr 58. Any danger in any of those, i'm scared :-(

My 2007 med record says: glucose 104, bun 25, creatinine 1.5, bun/creat ratio 17, egfr 58. Any danger in any of those, i'm scared :-(

Of what?: This is from 2007, which is 6 years ago and therefore of limited significance. Newer results are needed. Your creatinine is very slightly high for someone your age, but may have been falsely elevated due to dehydration. Don't be afraid, go get more current results and discuss them w/your doctor. ...Read more

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13yr f w/ t1dmwhat does this mean when results for bun wnl, creatinine is low 0.4, but 24 hr u protein and creatinie ratio are greater than 300?

High Urine P/C: Your u protein- creat ratio means you are spilling protein (p) in your urine. You now have good kidney function. See a physician to get a 24 hour urine for a creatinine clearance and protein to quantify the amount of p you have. You will need a drug like ramipril-an ace-inhibitor, or benicar, (olmesartan) an angiotensin receptor blocker to reduce the p you have. If this done, you will protect your kidneys. ...Read more