Pulmonary

PERC Rule Calculator

PE rule-out criteria for low-risk patients

Clinical use

Use this calculator for pe rule-out criteria for low-risk patients in thepulmonary workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.

Interpretation

All 8 criteria must be negative to rule out PE without D-dimer. Only apply when pre-test probability is LOW (<15%). Not validated for inpatients.

Required inputs

Age 50 +
Heart Rate 100 +
Oxy Sat 95 Or <
Unilateral Leg Swelling
Hemoptysis
Recent Surgery Or Trauma
Prior PE Or DVT
Hormone Use

Evidence and limitations

This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.

References

Kline JA et al. J Thromb Haemost 2004;2:1247-1255

Frequently asked questions

What is the PERC Rule?

PERC Rule is a clinical calculator used for PE rule-out criteria for low-risk patients.

How do I interpret the PERC Rule?

All 8 criteria must be negative to rule out PE without D-dimer. Only apply when pre-test probability is LOW (<15%). Not validated for inpatients.

What inputs are required for the PERC Rule?

Required inputs include Age 50 +, Heart Rate 100 +, Oxy Sat 95 Or <, Unilateral Leg Swelling, Hemoptysis, Recent Surgery Or Trauma, Prior PE Or DVT, Hormone Use.