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 Prerenal vs Intrarenal  



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Author8 Posts
  #1

In intrarenal problems/ATN, there is a concentrating defect, so why is the Urine Na MORE THAN 40. (spillage?)

Whats the normal Urine Na by the way?

Whats the best way to distinguish between Pre-renal and Intrarenal causes of Renal failure?
-BUN/Cr Ratio? Normal: 10/1
Prerenal : >20
Intrarenal: <10

What are the other helpful signs?








  #2

Ill start and answer some:

For prerenal--Fractional excretion of sodium less then 1 %. urine sodium less then 20, specific gravity greater then 1.020, many hyaline casts. I like the fracional excretion of sodium of less then 1%..


  #3

And Intrarenal/ATN:

Urine Osm: <350
Urine Na: >40 (WHY?)
Fractional excretion of Na >1%
Urine Sediment: Full (brownish pigmented granular casts, epithelial casts)
BUN/Cr Ratio <10
Specific gravity LOW

Still wondering WHY the Urine Na would be >40.... Any ideas? Can someone explain this?
Thanks.



  #4

guys, if I'm not wrong then in

Intra renal cases ..the urine osm ls >350 & urine Na is high & in

in pre renal cases ....the urin osm is <350 & this is b/c of low urin Na levels


  #5

confused


  #6

DrVirgo wrote:
And Intrarenal/ATN:


Still wondering WHY the Urine Na would be >40.... Any ideas? Can someone explain this?
Thanks.




Problem with reabsorption...




  #7

Actually:

In Prerenal, the Urine OSM is >500 and the Urine Na is <20
In Renal, the Urine OSM is < 350 and the Urine Na is >40
(this is from Kap Notes)


Dr.Luck wrote:
guys, if I'm not wrong then in

Intra renal cases ..the urine osm ls >350 & urine Na is high & in

in pre renal cases ....the urin osm is <350 & this is b/c of low urin Na levels




  #8

Thanks, I think thats right.


young_doc wrote:




Problem with reabsorption...








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