Table 2 Simplified pulmonary embolism Wells’ score [23, 25]

Clinical signs and symptoms of DVT (minimum of leg swelling and pain with palpation of the deep veins)

3

1

An alternative diagnosis is less likely than PE

3

1

Heart rate ≥100 beats per minute

1.5

1

Immobilisation (for >3 days) or surgery in the previous 4 weeks

1.5

1

Previous DVT/PE

1.5

1

Haemoptysis

1

1

Active cancer

1

1

Outcome

PE unlikely:

Score ≤4

Score 0 or 1

PE likely:

Score >4

Score ≥2