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Doctor insights on: Bun And Creatinine Levels In 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

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Dr. Buck Parker
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Dr. Ashu Syal
656 doctors shared insights

Dehydration (Definition)

In physiology and medicine, dehydration (hypohydration) is the excessive loss of body water, with an accompanying ...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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Dr. Buck Parker
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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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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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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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Dr. Buck Parker
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Which etiology results in an elevated bun level with a normal serum creatinine level?

Which etiology results in an elevated bun level with a normal serum creatinine level?

Multiple causes: BUN is a breakdown of ingested protein, but becomes elevated compared to creatine, in cases of increased catabolism (breakdown). Such things as a high protein diet, use of some steroids, some infections, or volume depletion may commonly raise BUN levels. In a hospital setting, tube feeding, tpn, GI bleeding, infections, decreased flow to the kidneys, and use of steroids are frequent contributors. ...Read more

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Food restiction for those patient who creatinine is irregular but bun level is normal i.E., diabetic patients?

Low sodium : Depending on the degree of kidney dysfunction, you would probably be advised a low sodium diet. They may also recommend low potassium. You should speak to a nutritionist. ...Read more

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Why is bun, creatinine, and electrolyte levels ordered on someone with ards?

Sick patient: When a patient has ards, thje patient is very sick. Thus other organs can get damaged including the kidney. BUN and creatinine are makers of kidney injury and your doctors are going to monitor its function routinely. The electrolytes are also changing and need to be corrected routinely. ...Read more

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Dr. Madhu Kandarpa
2,103 doctors shared insights

Creatinine (Definition)

It is a byproduct of creatine phosphate which is present in muscles. Levels are increased ...Read more


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