What are the typical reference ranges for Pulmonary Embolism Rule-Out Criteria (PERC)?

PERC Score: 0 (PE ruled out clinically if pre-test probability is low) | ≥ 1 (PERC positive; requires further testing)

What does a high or low result indicate?

The PERC rule assesses 8 clinical variables (age, pulse, hypoxia, unilateral swelling, hemoptysis, prior history, trauma, hormones) to rule out PE.

Evaluates low-risk patients suspected of pulmonary embolism to safely rule out PE clinically without requiring blood tests or imaging.

Age 50 years or older?

Heart Rate 100 beats per minute or higher?

Oxygen Saturation (SpO2) < 95% on room air?

Unilateral leg swelling?

Hemoptysis (coughing up blood)?

Recent trauma or surgery (within 4 weeks requiring hospitalization/anesthesia)?

Prior history of Deep Vein Thrombosis (DVT) or Pulmonary Embolism (PE)?

Oral hormone use (estrogens, oral contraceptives, HRT)?

Enter your clinical parameters to see dynamic diagnostic readings.