dr.wad wrote:in prerenal RF the kidney reabsorptive power is preserved>>>in this situatiom the kidney attempts to increase body fluids by increasing reabsorption of BUN. in intrarenal RF the kidney can nt reabsorb BUN....as the problem is in the tubular cells. in both conditions the Cr reabsorpion is not changed ( i dont know why ) that what i know .......hpoe this help 
Yes, thats how I remember it too:
In prerenal: Body thinks dehydration so it HOLDS ON to H20, Na, and BUN. So there is an INCREASE in BUN. BUN:Cr ratio > 20
In intrarenal: Kidney problem, so can't reab. Na, and can't reab BUN, so DECREASED BUN. BUN: Cr ratio < 10
But, what I can't remember is.. WHY is BUN only involved but NOT creatinine?
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| gr8doc
Forum Senior
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Because the Creat clearance for all the practical purposes is close to 1. so almost everything is excreted & the remaining is Secreted,there is no reabsorption.so If the Kidneys are functioning well, it will be cleared unless there is severe dehydration in which Creat levels will rise as well.
Hope this helps.
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| drxyz
Forum Senior
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in intrarenal Cr levels are also increased
pre renal only BUN levels are raised.
in post renal--initially only BUN levels are raised.if the the tubulrs are damaged from prolonged obstruction Cr levels goes up.
this information is according to Goljan notes,step1.
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