cardiovascular disorders
Unstable Angina
Cardiac markers
Patients suspected of having unstable angina should have a highly sensitive assay of cardiac troponin (hs-cTn) done on presentation and 2 to 3 hours later (at 0 and 6 hours if using a standard Tn assay). Creatine kinase (CK) is not elevated in unstable angina, but cardiac troponin, particularly when measured using high-sensitivity troponin tests (hs-cTn), may be slightly increased but does not meet criteria for myocardial infarction (above the 99th percentile of the upper reference limit or URL). 