A patient presents with 'Isosthenuria'. What does this imply about their renal function?
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Correct answer: The kidney can no longer concentrate or dilute urine
Isosthenuria is the excretion of urine with a constant specific gravity (usually 1.010) regardless of fluid intake. It reflects significant loss of renal tubular function, as the urine matches the specific gravity of the initial glomerular filtrate.
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