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Doctor insights on: Bun And Creatinine

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What does a high bun and creatinine reading indicate?

What does a high bun and creatinine reading indicate?

Co-tango usually: The BUN is usually 10 times the creatinine. When the creatinine goes up, the BUN goes up similarly to roughly keep this proportion, in most kidney disease states. The notable exception is when the creatinine goes up say by 20% to 1.2, but the BUN goes up *5 to 50. This strongly suggests a pre-renal state, commonly dehydration. Mild elevations of BUN with normal creatinines aren't of concern. ...Read more

Dr. Madhu Kandarpa
2,226 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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Why is bun and creatinine elevated in pneumonia?

Why is bun and creatinine elevated in pneumonia?

Renal insufficiency: The BUN and creatinine should not be elevated due to the pneumonia unless the pneumonia is non-bacterial (autoimmune), or due to group a strep pyogenes strains that induce glomerulnephritis. Generally the BUN and cr will be elevated in febrile patients with infection when they are dehydrated and corrects rapidly with fluid replacement. Also in septic shock there may be acute tubular necrosis. ...Read more

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What can low bun and creatinine indicate when you 21 yrs old?

What can low bun and creatinine indicate when you 21 yrs old?

Several things: Low cr may be completely normal in a young patient and indicates good kidney function. Other causes of low serum cr are low muscle mass, which can occur in very small stature people, advanced age, bed bound individuals, and in patients with cirrhosis. Low BUN can be caused by poor nutrition or increased fluid intake. ...Read more

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What's a way to decrease high bun and creatinine in my blood?

Get it evaluated: First of all, determine the cause and treat that. These values are usually high because of a reduction in kidney function or dehydration. See a kidney specialist (nephrologist). ...Read more

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How does bun and creatinine gets elevated due to dehydration? Kindly explain how?

Concentration: Simplest way, if you have lets say 100 particles in 5 liter of fluid, the concentration is 20 per liter. If you now have only 3 liter of fluid, the concentration is now 33.3. ...Read more

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Hi my 4y son has BUN 12, Creatinine 0.26 which is normal however his BUN/Creatinine Ratio is 46. Why would it be elevated?

Has no importance: The value of this ratio does not become important when the creatinine level is so low (but normal) in early childhood. It is only when the body mass has matured and the creatinine level rises that it can have any significance. Please do not freak over pre-printed lab reports generated by a computer. It is truly not an issue. ...Read more

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Healthy 35 yr old female w B/C ratio elevated at 23 with normal Bun and creatinine level of 16 (ref range 7-18) and 0.7. I did not drink much that day?

Healthy 35 yr old female w B/C ratio elevated at 23 with normal Bun and creatinine level of 16 (ref range 7-18) and 0.7. I did not drink much that day?

Tests, tests, tests: Tests results always have to be interpreted in a context. When they measure the temperature of the winner of the Boston Marathon 2 yrs ago it was over106 F. Was he very ill? NO! He had been using his bodies muscles at full output for over 2 hrs straight. The heat generated raised his body temp a lot and he soon cooled off. You hv to talk with yr doc or make a virtual consult. ...Read more

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Can UTI have a role in increased bun and creatinine?

Not usually : An uncomplicated, simple UTI (e.G, cystitis /bladder infection) would not affect your bun/creatinine/gfr which are the blood tests that reflect the overall function of the kidneys. A complicated, severe UTI affecting the kidneys (pyelonephritis) could, directly and or indirectly, affect kidney function and these blood tests if associated with sepsis, obstruction, or significant dehydration. ...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

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BUN = 6 Creatinine = .58 BUN/Creatinine = 10 I read that a 10 warrants further tests to determine if intrinsic kidney damage. Does that apply here?

BUN = 6
Creatinine = .58
BUN/Creatinine = 10

I read that a 10 warrants further tests to determine if intrinsic kidney damage.  Does that apply here?

Just a ratio: Since your BUN is normal and your creatinine is less than 1 which is also normal, you should not worry. Ask your doctor in your follow up visit to review your concerns with you. ...Read more

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I'm African American. Please explain what these results should mean to me. BUN 19, Creatinine 1.28, GFR 46.

I'm African American. Please explain what these results should mean to me. BUN 19, Creatinine 1.28, GFR 46.

Your kidney: Function is slightly lower than normal but not too bad. Stay away from NSAIDs and talk to your doc. Stay well hydrated ...Read more

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My lab results were normal for bun and creatinine however bun/creatinine ratio was high?

Possibly Dehydration: Thank goodness, your kidney function is normal. But any increase bun/creatinine ratio, typically > 20 could mean that you are dehydrated. ...Read more

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My 2 yr old son had bun, bun/creatinine ratio and hemoglobin done. His hemoglobin was 10.8, bun 17, and creatinine 40. What does this mean?Concerning?

Ok, with explanation: I suspect the creatinine was 0.40, not 40. Unless the units are different. Either way, the BUN and creatinine are fine in this case, and what you'd expect. The ratio, bun/cr is going to be huge since the creatinine is expected to be low. Don't worry about that. The hemoglobin is a little low, but not hugely low. Talk with your doc about iron rich foods and a recheck in a few months. ...Read more

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If i was taking 200mg of spironolactone when I have my lab work done, would that affect the bun and creatinine level? Would it make it higher or lower

Likely no effect,,,: This is a potassium sparing diuretic and is a weak diuretic other than this function. This and other diuretics should not have an effect on BUN and creatinine as these are based on amounts in the blood and creatinine is recovered by the kidney and so depend on renal function. Good luck. ...Read more

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What does it mean i just picked my lab results:bun 35, creatinine 2.00, chloride 93?

What does it mean i just picked my lab results:bun 35, creatinine 2.00, chloride 93?

Renal Insufficiency: It sure sounds like your doctor should have you seeing a nephrologist for early renal failure. ...Read more

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