Renal insufficiency Acute kidney injury Sudden loss of renal function, as manifested by decreased urine production, and a rise in serum creatinine or blood urea nitrogen concentration (azotemia). HP:0001919 Acute renal failure Acute renal failure is usually classified into prerenal (response to severe volume depletion), intrinsic (response to acute cytotoxic, ischemic, or inflammatory insults) and postrenal (response to obstruction of the passage of urine) etiologies. Acute kidney failure MSH:D058186 UMLS:C0022660 UMLS:C2609414 SNOMEDCT_US:14350001000004108 SNOMEDCT_US:14669001