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=== Azotemia renal ===
Renal azotemia (acute renal failure) typically leads to [[uremia]]. It is an intrinsic disease of the kidney, generally the result of renal [[parenchyma]]l damage. Causes include [[renal failure]], [[glomerulonephritis]], [[acute tubular necrosis]], or any other kind of [[renal disease]].<ref name=goljanpath />
The BUN:Cr in renal azotemia is less than 10.{{Citation needed|date=July 2009}} In cases of renal disease, glomerular filtration rate decreases. So nothing gets filtered as well as it normally would. However, in addition to not being normally filtered, what urea does get filtered is not reabsorbed by the proximal tubule as it normally would be. This results in lower levels of urea in the blood and higher levels of urea in the urine. Creatinine filtration decreases, leading to higher amount of creatinine in the blood. <ref name=goljanpath />
=== Azotemia posrenal ===
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