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Doctor insights on: Bun Creatinine Ratio Dehydration

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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

Dr. Madhu Kandarpa
2,220 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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How can the bun/creatinine ratio indicate dehydration?

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 certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids. ...Read more

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How does the bun/creatinine ratio show whether you have dehydration?

How does the bun/creatinine ratio show whether 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 be over 20 for a patient to be considered dehydrated or in "pre renal kidney failure. ...Read more

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My potassium is high but I'm not dehydrated. Bun/creatinine ratio is high and other electrolytes are borderline. What could be wrong?

My potassium is high but I'm not dehydrated. Bun/creatinine ratio is high and other electrolytes are borderline. What could be wrong?

May be...: The depicted scenario leads one to think: kidney damage, drug misuse / side effects, internal bleeding to gi-tract, etc. If no dehydration. So, ask and check with doctor for detail and he/she can help you. ...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 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 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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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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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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Is it of concern when the bun/creatinine ratio is at 21 but bun is at 18 mg/dl and creatinine is at 0.87 mg/dl with a low mchc of 31.2?

See below: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, your BUN and creatinine are fine. If you hemoglobin is above 14 gm, do not worry about the MCHC.
For good health — Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. ...Read more

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Is bun/creatinine ratio 31.7 ok?

How do you FEEL?: Labs mean nothing apart from the person's history and physical. This could be a young girl who recently enjoyed a generous lean chicken dinner. ...Read more

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What does bun/creatinine ratio of 29 mean?

depends: The 'normal' ratio is 10:1, this will increase if you become volume depleted. Steroids, high protein diet, gastrointestinal bleeding and renal failure can raise the ratio. ...Read more

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Bun/creatinine ratio 23 what does this mean?

BUN-creatinine ratio: The BUN (b)-creatinine (c) ratio is the association with b and c. If your b/c was 20, you would have a b of 20 and a c of 1 in your blood. In your case, you could have had a b of 23 and a c of 1. ...Read more

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What does an elevated bun/creatinine ratio 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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What does a high bun/creatinine ratio reading mean?

What does a high bun/creatinine ratio reading mean?

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 certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids. ...Read more

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High bun and bun/creatinine ratio results? Dangerous?

High bun and bun/creatinine ratio results? Dangerous?

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 certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids. Your doctor determines its significance. ...Read more

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What is the cause of high bun creatinine ratio in children?

BUN/Cr Ratio: The most common cause of a high blood urea nitrogen (BUN) to creatinine ratio is dehydration. A ratio over 20 indicates low intravascular volume. The BUN can also be elevated in people with a high muscle mass. ...Read more

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Is a BUN/CREATININE Ratio of 29 normal in a 38 yr old woman?

No worries: If your BUN and creatinine are both normal, the ratio has little significance. It may reflect mild dehydration. Drink more water. ...Read more

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High bun and bun/creatinine ratio results. What does this mean?

Dehydration: Is most common cause of high BUN with normal creatinine (therefore high ratio). Other causes can be high protein load in the diet, muscle injury or muscle breakdown (bun is formed by the breakdown of proteins). Whether to worry depends on how high the BUN is, and the circumstances when the test was drawn. Talk to the doctor who ordered the test for personalized interpretation. ...Read more

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Low creatinine and elevated bun/creatinine ratio. Please explain?

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 does it mean low creatinine levels and high bun creatinine ratio?

Muscle mass: Serum levels of creatinine depend on renal function, muscle mass and intake of muscles foods. A low creatinine level is of no consequence as long as you are not emaciated. Paralyzed, or have extensive amputations. High ratio just reflects low creatinine. ...Read more

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Is a BUN/Creatinine ratio test the same test as a microalblbumin/creatinine ratio test?

No: BUN = Blood urea nitrogen, creatinine and albumin are all different chemicals in blood and urine that can be measured. BUN/Creatinine ratio is a blood test. Microablumin/creatinine ratio is a urine test. ...Read more

Dr. Ashu Syal
655 doctors shared insights

Dehydration (Definition)

The excessive loss of body water, with an accompanying ...Read more