Simplified Pulmonary Embolism Severity Index
| Parameter | Score | Risk class | Total points |
| Age >80 years | 1 | Low | 0 |
| Cancer* | 1 | High | ≥ 1 |
| Chronic cardiopulmonary disease | 1 | ||
| Pulse ≥110 bpm | 1 | ||
| Systolic blood pressure < 100 mm Hg | 1 | ||
| Arterial blood oxygen saturation < 90%† | 1 |
*Defined as active cancer (diagnosed within last 12 months or undergoing treatment, personal communication from Prof David Jimenez).
†With or without the administration of supplemental oxygen.