Previous pulmonary embolism or deep vein thrombosis | +2 | Previous pulmonary embolism or deep vein thrombosis | +1.5 |
Heart rate >100 beats per minute | +1 | Heart rate >100 beats per minute | +1.5 |
Recent surgery | +3 | Recent surgery or immobilization | +1.5 |
Age, years | | Clinical signs of deep vein thrombosis | +3 |
60–79 | +1 | Alternative diagnosis less likely than | +3 |
≥80 | +2 | Pulmonary embolism | +1 |
PaCO2 | +2 | Hemoptysis | +1 |
<4.8 kPA (36 mm Hg) | +1 | Cancer | |
4.9–5.19 kPa (37–38.9 Hg) | +4 | | |
PaO2 | +3 | | |
<6.5 kPa (48.7 mm Hg) | +2 | | |
6.5–7.99 kPa (48.7–55.0 mm Hg) | +1 | | |
8–9.49 kPa (60–71.2 mm Hg) | +1 | | |
9.5–10.99 kPa (71.4–82.4 mm Hg) | +1 | | |
Atelectasis | 0–4 | | |
Elevated hemidiaphragm | 5–8 | | |
Clinical probability | ≥9 | Clinical probability | 0–1 |
Low | | Low | 2–6 |
Intermediate | | Intermediate | ≥7 |
High | | High | |