Which of the following is a prerenal renal labs finding?

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Multiple Choice

Which of the following is a prerenal renal labs finding?

In prerenal azotemia the kidneys are underperfused, so the body conserves water and solutes. This leads to increased reabsorption of urea in the proximal tubule, causing the BUN to rise disproportionately compared with creatinine. The result is an elevated BUN to creatinine ratio, which is a classic clue pointing to prerenal causes of kidney dysfunction. A ratio greater than 10:1 (often quoted as >20:1 in many texts) reflects this mechanism and helps distinguish prerenal azotemia from intrinsic renal disease, where the ratio tends to normalize or be lower and urine sediment may show granular casts from tubular injury. The other findings—low urine sodium and concentrated urine—support prerenal states but are less specific than the BUN/creatinine ratio for distinguishing prerenal from intrinsic renal injury.

In prerenal azotemia the kidneys are underperfused, so the body conserves water and solutes. This leads to increased reabsorption of urea in the proximal tubule, causing the BUN to rise disproportionately compared with creatinine. The result is an elevated BUN to creatinine ratio, which is a classic clue pointing to prerenal causes of kidney dysfunction. A ratio greater than 10:1 (often quoted as >20:1 in many texts) reflects this mechanism and helps distinguish prerenal azotemia from intrinsic renal disease, where the ratio tends to normalize or be lower and urine sediment may show granular casts from tubular injury. The other findings—low urine sodium and concentrated urine—support prerenal states but are less specific than the BUN/creatinine ratio for distinguishing prerenal from intrinsic renal injury.

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