VTECardiology

Pulmonary Embolism Rule-Out Criteria

Rules out PE without further testing when ALL 8 criteria are absent and pre-test probability is low (<15%). Sensitivity >97%.

Age ≥ 50 years?

Heart rate ≥ 100 bpm?

SpO₂ < 95% on room air?

Unilateral leg swelling?

Haemoptysis?

Recent surgery or trauma (requiring general anaesthesia within 4 weeks)?

Prior DVT or PE?

Oestrogen use (OCP, HRT, or hormone-containing contraceptives)?

PERC Criteria Met/ 8

PERC Negative — PE can be excluded if pre-test probability is low

All 8 PERC criteria absent. In low pre-test probability patients (Wells PE ≤1 or clinical gestalt <15%), this rules out PE. No D-dimer or imaging required. Do not apply PERC to patients with intermediate or high clinical suspicion — proceed directly to D-dimer or CTPA in those cases.

Reference: Kline JA et al. J Thromb Haemost 2004

Medical Disclaimer: This calculator is a clinical decision support tool for qualified healthcare professionals. It does not replace clinical judgement. Always interpret results in the full clinical context. Reference: Kline JA et al. J Thromb Haemost 2004.

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