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According to 2010 FA, postrenal ARF will present urine osmolarity<350, urine Na>40, FENa>4 and BUN/Cr>15.

My question is what is the primary demage site/mechanisms accounting for these biochemical abnormalities?

Any thoughts would be appreciated.
 

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I had the same doubts as you. But I came to a conclusion that postrenal failure is just like intrinsic renal failure, back pressure builds up and the kidney get failed, that's the mechanism and therefore the biochem abnormalities is similar to renal renal failure
 
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