 Background: Acute kidney injury is common amongst intensive care patients and is associated with extremely high mortality and morbidity in terms of increased risk of developing Chronic Kidney Disease CKD and End Stage Renal Disease ESRD. Patients with CKD are at increased risk of cardiovascular, cerebro-vascular disease and long term increased risk of death. Those patients who progress to ESRD have a 20 mortality risk per year in Sweden. Outcome after acute kidney injury in the Swedish critical care population has never previously been described. 