Data Set Specifications (DSS) are metadata sets that are not mandated for collection but are recommended as best practice. It is recommended that, if collecting data for purposes of primary patient care, planning or analysis, the entire DDS be collected. This metadata set is primarily concerned with the clinical use of acute coronary syndrome data. While the use of this standard is voluntary, it should be used by health and health-related establishments that create, use or maintain, records on health care clients. The Acute Coronary Syndrome (Clinical) DSS aims to ensure national consistency in relation to defining, monitoring and recording information on patients diagnosed with acute coronary syndrome.