Hematology

PERC Rule

Pulmonary Embolism Rule-out Criteria for low-risk patients

Share with colleagues

Input Parameters

Age ≥50 years*

Heart rate ≥100 bpm*

O₂ saturation <95% on room air*

Hemoptysis*

Estrogen use*

Surgery or trauma requiring hospitalization within 4 weeks*

Previous PE or DVT*

Unilateral leg swelling*

Clinical Note (Optional)

0/500 characters

Other evidence-based tools commonly used alongside this calculator

Absolute Neutrophil Count (ANC)

Calculate ANC for infection risk assessment in neutropenic patients

ISTH-BAT Bleeding Assessment

ISTH Bleeding Assessment Tool — quantifies personal/family bleeding history to identify abnormal bleeding and guide coagulation workup

Corrected Reticulocyte Count

Adjusted reticulocyte count for anemia assessment

Sokal Score for CML

Risk stratification for Chronic Myeloid Leukaemia — guides TKI therapy selection and intensity of monitoring