| Age>65 years | Yes No |
| Greater than or equal to 3 cardiac risk factors* | No Yes |
| ST Deviation | No Yes |
| Aspirin use in last 7 days | No Yes |
| Greater than or equal to 2 anginal events in past 24 hrs | No Yes |
| Elevated Troponin | No Yes |
| Established CAD | No Yes |
*Risk Factors = hypertension, cigarette smoking, obesity, physical inactivity, dyslipidemia, DM, micro-albuminuria, GFR <60/min, family h/o premature CVD