4PEPS Score Calculator
Assess the pretest clinical probability of pulmonary embolism with the validated 4PEPS scoring system.
Last updated on: April 15, 2026
Pulmonary Embolism 4PEPS Calculator
What is the 4PEPS score?
4PEPS is a 4-level clinical pretest probability score for suspected pulmonary embolism.
It links the score to a diagnostic strategy: no test, D-dimer with optimized thresholds, or imaging.
Why use it?
- It standardizes bedside assessment of suspected pulmonary embolism.
- It may reduce unnecessary D-dimer or CT pulmonary angiography in appropriate patients.
- It connects the score directly to the next diagnostic step.
Interpretation
- Very low (< 0): rule out clinically without D-dimer.
- Low (0–5): rule out if D-dimer < 1000 ng/mL.
- Moderate (6–12): rule out if D-dimer below age-adjusted cutoff (or < 500 if age ≤ 50).
- High (≥ 13): proceed to imaging (do not rely on D-dimer alone).
How to use the result
The 4PEPS score is a clinical decision-support tool used to estimate the pretest probability of pulmonary embolism in patients with suspected PE. It should not be used in isolation or as a substitute for full medical assessment. The result must always be interpreted together with the patient’s symptoms, vital signs, medical history, physical examination, and the clinician’s overall judgment. Local diagnostic pathways, D-dimer availability, and imaging protocols should also be taken into account before making a final decision.
This page has been medically reviewed by Dr. Khoulah Attia – PharmD, Immunology Specialist.