Assess the probability of pulmonary embolism in patients with low clinical suspicion using validated PERC criteria.
Use this calculator to evaluate patients for pulmonary embolism using the PERC (Pulmonary Embolism Rule-out Criteria) score. This tool helps determine if D-dimer testing is necessary in low-risk patients.
Click on any example to load it into the calculator.
A young patient with no risk factors, likely to have a PERC score of 0.
Age < 50 years: Yes
Heart Rate < 100 bpm: Yes
Oxygen Saturation ≥ 95%: Yes
No Unilateral Leg Swelling: Yes
No Hemoptysis: Yes
No Surgery/Trauma in Past 4 Weeks: Yes
No Prior PE or DVT: Yes
No Estrogen Use: Yes
A middle-aged patient with some risk factors, demonstrating moderate PERC score.
Age < 50 years: No
Heart Rate < 100 bpm: Yes
Oxygen Saturation ≥ 95%: Yes
No Unilateral Leg Swelling: Yes
No Hemoptysis: Yes
No Surgery/Trauma in Past 4 Weeks: Yes
No Prior PE or DVT: Yes
No Estrogen Use: No
An elderly patient with multiple risk factors, showing higher PERC score.
Age < 50 years: No
Heart Rate < 100 bpm: No
Oxygen Saturation ≥ 95%: Yes
No Unilateral Leg Swelling: Yes
No Hemoptysis: Yes
No Surgery/Trauma in Past 4 Weeks: No
No Prior PE or DVT: Yes
No Estrogen Use: Yes
A complex case demonstrating how multiple factors affect PERC scoring.
Age < 50 years: No
Heart Rate < 100 bpm: No
Oxygen Saturation ≥ 95%: No
No Unilateral Leg Swelling: No
No Hemoptysis: Yes
No Surgery/Trauma in Past 4 Weeks: Yes
No Prior PE or DVT: No
No Estrogen Use: No