ISO/ TS 22367:2008 characterizes the application of ISO 15189 as a system for reducing laboratory error and improving patient safety by applying the principles of risk management, with reference to examination aspects, especially to pre- and post-examination aspects, of the cycle of laboratory medical care. ISO/ TS 22367:2008 proposes a methodology for finding and characterizing medical laboratory error that would be avoided with the application of ISO 15189.