Parameter
Score
Clinical signs of DVT (pain and swelling)
3
Alternative diagnosis less likely
3
Tachycardia 1 (>100bpm)
1.5
Immobile for 3 days or major surgery in the past 4 weeks
1.5
Previous VTE
1.5
Haemoptysis
1
Active cancer 1 (within 6 months)
1
Score ≤ 4
"PE Unlikely"
(3% incidence of PE)
(3% incidence of PE)
Investigate with a D-dimer 1
Score ≥ 4
"PE Likely"
Investigate with a CTPA 1