Table 2.

Geneva and Wells Prediction Rules for Pulmonary Embolism

Geneva Score	Points	Wells Score	Points
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

PaCO₂ = partial pressure of carbon dioxide, arterial; PaO₂ = partial pressure of oxygen, arterial.

Adapted from Am J Med, Vol 113, Chagnon I, Bounameaux H, Aujesky D, et al, Comparison of two clinical prediction rules and implicit assessment among patients with suspected pulmonary embolism, pp 269–275, Copyright 2002, with permission from Elsevier.