Decision SupportCalculators

Professional clinical decision-support tools designed for emergency medicine providers to support evidence-based decision making.

Why Choose Our Calculators?

Built by emergency medicine clinicians, for emergency medicine clinicians, with the latest evidence-based algorithms and validation studies.

Evidence-Based

All algorithms validated against clinical data and peer-reviewed research.

Clinician-Designed

Built by healthcare professionals who understand clinical workflows.

Real-Time Updates

Always current with the latest clinical guidelines and research findings.

Available Calculators

Browse our clinical decision-support calculators designed specifically for emergency medicine providers.

Emergency Medicine Decision Support

Clinical decision-support tools for emergency medicine providers

Aortic Dissection

Calculate pretest probability for aortic dissection based on clinical presentation and risk factors using evidence-based likelihood ratios

ADD-RS Methodology

Evidence-Based Statistics

Sequential Bayes' Theorem

5 Clinical Risk Factors

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Canadian CT Head Rule (CCHR)

Use for adults (≥16) with blunt head trauma, GCS 13–15, plus LOC, amnesia, or disorientation. Helps determine need for CT head scan

7 Exclusion Criteria

5 High-Risk Factors

2 Medium-Risk Factors

Evidence-Based CT Decision Support

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Ectopic Pregnacy

Estimate probability of ectopic pregnancy using a gestalt prior with exam and TVUS likelihood ratios (Bayes).

PERC (Pulmonary Embolism Rule-out Criteria)

Use PERC only when pretest probability for PE is low (≤15%). If all eight criteria are absent, PE testing is generally not indicated

8 Clinical Criteria

Low-Risk Patient Focus

Rule-out Tool

Evidence-Based Decision Support

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Pulmonary Embolism Severity Index (PESI)

Traditional, point-based risk stratification for PE with 11 clinical parameters and 5-class risk stratification

11 Clinical Parameters

5-Class Risk Stratification

Mortality Estimates

Clinical Guidance

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Spinal Epidural Abscess (SEA)

Safety Gate → AVS prior → risk factors → optional ESR/CRP with interval LRs. Thresholds: <0.5% alternatives; 0.5–2% labs; >2% MRI.

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