Evaluation of the usefulness of a D dimer test in combination with clinical pretest probability score in the prediction and exclusion of Venous Thromboembolism by medical residents

Table 2 Rules for predicting the probability of pulmonary embolism (adapted from Wells et al. [15])

Variable	No. of points
Risk factors
Clinical signs and symptoms of deep venous thrombosis	3.0
An alternative diagnosis deemed less likely than pulmonary embolism	3.0
Heart rate >100 beats/min	1.5
Immobilization or surgery in the previous 4 weeks	1.5
Previous deep venous thrombosis or pulmonary embolism	1.5
Hemoptysis	1.0
Cancer (receiving treatment, treated in the past 6 months, or palliative care)	1.0
Clinical probability
Low	<2.0
Intermediate	2.0-6.0
High	>6.0

ISSN: 1477-9560