 | Prep for USMLE |
| Forum | Resources | New Posts | Register | Login | » |
|
| Author | 4 Posts | |||||||||||||||||||||||||||||||
|
DrVirgo
Forum Junior  Topics: 731 Posts: 3487 |
In Prerenal Azotemia, the BUN: Cr ratio is > 20 In Intrarenal or ATN, the BUN: Cr ratio is <10 WHY??? What causes this?
|
Prep4USMLE.com
|
Advertisement
|
|
dr.wad
| Forum Elite  Topics: 3 Posts: 386
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 
|
DrVirgo
| Forum Junior Topics: 731 Posts: 3487
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?
|
gr8doc
| Forum Senior Topics: 8 Posts: 204
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.
|
|
| | |||||||||||||||||||
|
This thread is closed, so you cannot post a reply.
 Similar forum topicsPrerenal vs Postrenal BUN:Cr Ratio Prerenal vs Intrarenal protein/cr ratio | Related resources |
Advertise | Support | Premium | Contact |