During this stage, one of the following occurs - either a rise in serum creatinine of 26 millimoles per liter (μmol/L) or greater within 48 hours; 50 percent or greater increase in serum creatinine (1.5 fold from baseline) within the preceding seven days; or a fall in urine output to less than 0.5 mL/kg/hour for more than six hours.