Centers for Disease Control and Prevention, National Healthcare Safety Network

Annual standardized infection ratio (SIR) of bloodstream infections (BSIs) among children and adults receiving maintenance hemodialysis at outpatient hemodialysis facilities. BSIs are defined as positive blood cultures for hemodialysis patients which are reported monthly by participating facilities. The SIR is reported for a yearly period (calendar year) and is calculated by dividing the number of observed BSIs by the number of predicted BSIs during the year.