Acute kidney injury (AKI) is a common finding in intensive care unit (ICU) patients. Approximately 30 to 65% of patients experience an episode of AKI, and 5% of ICU patients are treated with renal replacement therapy. AKI is associated withimportant short term and long-term morbidity as well as mortality, and therefore also with costs. Finally, there is a close link between chronic kidney disease (CKD) and AKI. CKD patients are at greater risk for developing AKI, and survivors of AKI treated with renal replacement therapy (AKI-RRT), may develop chronic kidney disease (CKD) and end stage kidney disease (ESKD).