Renal insufficiency true Renal failure A reduction in the level of performance of the kidneys in areas of function comprising the concentration of urine, removal of wastes, the maintenance of electrolyte balance, homeostasis of blood pressure, and calcium metabolism. SNOMEDCT_US:236423003 HP:0000084 HP:0000083 UMLS:C1565489 SNOMEDCT_US:42399005 HP:0004723 UMLS:C0035078 Renal failure in adulthood UMLS:C1839604 Abnormal renal physiology