Medical Calculators for Emergency Medicine
Fast, evidence-based decision support tools for the emergency department. From PE risk stratification to trauma scoring — everything you need at the bedside.
Curated Tools for Emergency Medicine (12)
PERC Rule
Use PERC (Pulmonary Embolism Rule-out Criteria) to rule out PE in low-risk patients without D-dimer or CT when all 8 criteria are negative.
Wells Score (PE)
Calculate Wells Score for PE to estimate pretest probability and guide D-dimer testing versus direct CTPA for pulmonary embolism workup.
Age-Adjusted D-dimer
Calculate age-adjusted D-dimer cutoffs to improve specificity in PE/DVT rule-out pathways for older adults.
HEART Score
Calculate the HEART Score to assess the risk of major adverse cardiac events (MACE) in patients presenting with chest pain.
CURB-65 Score
Calculate CURB-65 for community-acquired pneumonia severity to guide outpatient treatment, hospital admission, or ICU-level evaluation.
Glasgow Coma Scale
Calculate the Glasgow Coma Scale score to assess level of consciousness. Used worldwide in emergency medicine and trauma assessment.
Shock Index
Calculate the Shock Index (HR/SBP ratio) for rapid hemodynamic assessment. Normal: 0.5–0.7. Score ≥1.0 indicates hemodynamic compromise; ≥1.4 indicates severe shock requiring immediate intervention.
qSOFA Score
Calculate qSOFA bedside sepsis risk score. A score of 2 or more (altered mentation, RR ≥22, SBP ≤100) flags high-risk infection requiring urgent evaluation.
NEXUS C-Spine
Apply the NEXUS criteria to determine if cervical spine imaging is needed after trauma. All 5 criteria absent gives 99.8% NPV for significant C-spine injury, safely avoiding CT or X-ray.
Canadian Head CT
Apply the Canadian CT Head Rule to determine if CT is needed after minor head injury (GCS 13–15). Achieves 98.4% sensitivity for neurosurgically significant injuries, safely reducing CT use.
Alvarado Score
Calculate Alvarado score to estimate appendicitis likelihood from symptoms, signs, and basic lab findings.
Wells Score (DVT)
Calculate Wells DVT pretest probability in seconds. Score 10 clinical criteria for low, moderate, or high DVT risk — with D-dimer and ultrasound next steps.
Frequently Asked Questions
These calculators are for educational and clinical decision support purposes only. Always apply clinical judgment and consult current institutional guidelines. Results are not a substitute for full clinical assessment.