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Old 11-10-2011
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Urine Sample Why level of Na in urine so low in prerenal ARF?

In contrast to intrinsic ARF, prerenal ARF has low level of Urine Na.
I think it is the result from the activation of RAAS.
but when I study hypoNatremia, i got a confliction.

In some circumstances like LC and CHF in which effective circulating volume is low, ADH plays important role to support circulating volume by reabsorbing water. ( i know of course, RAAS will be activated) and the serum will be hyponatremic. To make serum hyponatremic, i think the body has to make more concentrated urine in Na than serum. but why prerenal ARF has low concetration of Na?

thanks for your help.
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Old 11-10-2011
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Urine osmolality in prerenal azotemia

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