PERC rule out criteria and Wells score for pulmonary embolism

PERC:

1. age < 50

2. HR < 100

3. SpO2 ? 95%

4. No unilateral leg swelling

5. No hemoptysis

6. No recent trauma or surgery

7. No prior DVT or PE

8. No hormone use

Wells:

1. Clinical signs and symptoms of DVT? (+3)

2. Pulmonary embolism is most likely diagnosis (+3)

3. HR > 100 (+1.5)

4. Immobilization of ?3 days or surgery in previous 4 weeks (+1.5)

5. Previous PE or DVT (+1.5)

6. Hemoptysis (+1)

7. Malignancy with treatment in past 6 months, or palliative (+1)

Score ?4 qualifies to rule out with D dimer [JAMA 295 (2): 172-9]

http://www.mdcalc.com/wells-criteria-for-pulmonary-embolism-pe