Oliguria

A pathological reduction of urine excretion defined in adults as urinary output <400-500 mL/24 h or <0.5 mL/kg/h, and represents an early clinical marker of impaired renal perfusion or intrinsic kidney dysfunction. Possible causes are prerenal factors (dehydration, hemorrhage, circulatory shock, heart failure), renal factors (chronic kidney disease, inflammation, NSAIDs, chemotherapy, toxins), postrenal factors (urolithiasis, tumor, benign prostate hyperplasia).