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DrVirgo
Forum Junior  Topics: 731 Posts: 3487 |
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?
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mjl1717
| Forum Junior  Topics: 964 Posts: 5442
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%..
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DrVirgo
| Forum Junior Topics: 731 Posts: 3487
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.
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Dr.Luck
| Forum Senior Topics: 12 Posts: 221
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
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mjl1717
| Forum Junior Topics: 964 Posts: 5442
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young_doc
| Forum Guru  Topics: 59 Posts: 718
DrVirgo wrote: And Intrarenal/ATN: Still wondering WHY the Urine Na would be >40.... Any ideas? Can someone explain this? Thanks. Problem with reabsorption...
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DrVirgo
| Forum Junior Topics: 731 Posts: 3487
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
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DrVirgo
| Forum Junior Topics: 731 Posts: 3487
Thanks, I think thats right. young_doc wrote: Problem with reabsorption...
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 Similar forum topicsPrerenal vs Intrarenal(ATN) BUN:Cr Ratio Prerenal vs Postrenal BUN:Cr Ratio prerenal causes | Related resources |
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