The History, ECG, Age, Risk Factors and Troponin (HEART) Score risk stratification tool for chest pain patients
| History | Not suggestive | 0 |
| Moderately suggestive | 1 | |
| Highly suggestive | 2 | |
| ECG | Normal | 0 |
| Non-specific repolarisation disturbance, left bundle branch block, paced rhythm, T-wave inversion with no ST changes | 1 | |
| Significant ST deviation=1. 0.05 mV in two or more contiguous leads or 2 ST depression of >1 mV | 2 | |
| Age (years) | <45 | 0 |
| 45–65 | 1 | |
| ≥65 | 2 | |
| Risk factors | No risk factors | 0 |
| 1–2 risk factors (hypertension, diabetes, obesity, smoker, hypercholesterolaemia, family history) | 1 | |
| 3 risk factors or known atherosclerotic disease | 2 | |
| Troponin | < normal limit | 0 |
| 1–2 times normal limit | 1 | |
| >3 times normal limit | 2 |