Which statement about intrarenal disease is most accurate regarding urinalysis?

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Multiple Choice

Which statement about intrarenal disease is most accurate regarding urinalysis?

In intrarenal (intrinsic) kidney disease, damage to the tubules and interstitium leads to elements from the kidney appearing in the urine sediment. The most characteristic urinalysis finding is the presence of casts formed in the renal tubules. Granular casts arise from sloughed tubular cells and protein and are classically seen in acute tubular necrosis, a common intrinsic renal injury. White casts reflect tubulointerstitial inflammation, as seen with acute interstitial nephritis. Together, granular or white casts on sediment directly indicate tubular or interstitial pathology, making this option the best reflection of intrarenal disease on urinalysis. Urine sodium >40, while it can accompany intrinsic renal injury, is a urine chemistry measurement rather than a urine sediment finding. The BUN/Cr ratio is a serum chemistry ratio, not a urinalysis finding. A high specific gravity would suggest preserved concentrating ability typical of prerenal states, not reliably intrinsic renal disease, so it’s not as characteristic as the presence of casts.

In intrarenal (intrinsic) kidney disease, damage to the tubules and interstitium leads to elements from the kidney appearing in the urine sediment. The most characteristic urinalysis finding is the presence of casts formed in the renal tubules. Granular casts arise from sloughed tubular cells and protein and are classically seen in acute tubular necrosis, a common intrinsic renal injury. White casts reflect tubulointerstitial inflammation, as seen with acute interstitial nephritis. Together, granular or white casts on sediment directly indicate tubular or interstitial pathology, making this option the best reflection of intrarenal disease on urinalysis.

Urine sodium >40, while it can accompany intrinsic renal injury, is a urine chemistry measurement rather than a urine sediment finding. The BUN/Cr ratio is a serum chemistry ratio, not a urinalysis finding. A high specific gravity would suggest preserved concentrating ability typical of prerenal states, not reliably intrinsic renal disease, so it’s not as characteristic as the presence of casts.

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