Clinical Scoring
Guides & Calculators
Step-by-step calculation guides for the most important clinical scoring systems in critical care, cardiology, and emergency medicine — each with a live embedded calculator.
3
In-depth guides
3
Live calculators
~41 min
Total read time
ESC / Sepsis-3
Guideline-aligned
Objective Decision-Making
Clinical scores replace subjective gestalt with validated, reproducible criteria — reducing diagnostic variability and anchoring bias.
Mortality Prediction
Scores like SOFA provide calibrated mortality estimates that guide ICU resource allocation, family communication, and escalation decisions.
Guideline Compliance
ESC, AHA, and Sepsis-3 guidelines mandate specific scores for treatment decisions. Mastering them ensures you practice to the highest standard.
Sepsis-3 (Singer et al., JAMA 2016)
How to Calculate SOFA Score Step by Step — With Live Calculator
The Sequential Organ Failure Assessment (SOFA) score is the Sepsis-3 cornerstone for diagnosing sepsis and monitoring ICU organ dysfunction. Master all 6 organ systems, serial scoring, and mortality prediction.
Key Clinical Points
- Sepsis-3 diagnostic criterion: SOFA increase ≥ 2 from baseline
- 6 organ systems scored 0–4 each (max 24)
- Serial SOFA at 48h predicts mortality better than single score
- qSOFA for rapid bedside screening outside ICU
- SOFA ≥ 15 → ICU mortality > 80%
Dr. Aisha Rahman
Intensivist & Emergency Physician
Score at a Glance
Score Range
0 – 24
Specialty
Critical CareGuideline Reference
Sepsis-3 (Singer et al., JAMA 2016)
Read Time
12 min · ~3000 words
SOFA Score Calculator
Interactive calculator with real-time scoring, clinical interpretation, and treatment recommendations.
Open SOFA CalculatorFull Step-by-Step Guide
12 min · with embedded calculator
ESC 2020 AF Guidelines (Hindricks et al.)
How to Calculate CHA₂DS₂-VASc Score — AF Stroke Risk & Anticoagulation Guide
The global standard for stroke risk stratification in non-valvular atrial fibrillation. Every risk factor, the female sex modifier nuance, DOAC selection, HAS-BLED counterbalance, and special populations.
Key Clinical Points
- Score ≥ 2 → oral anticoagulation recommended (DOAC preferred)
- Female sex is a risk modifier, not an independent risk factor
- Age ≥ 75 scores 2 points — highest single-variable weight
- Prior stroke/TIA scores 2 points — anticoagulation mandatory
- HAS-BLED ≥ 3 = modify risk factors, not withhold anticoagulation
Dr. Sarah Mitchell
Interventional Cardiologist
Score at a Glance
Score Range
0 – 9
Specialty
CardiologyGuideline Reference
ESC 2020 AF Guidelines (Hindricks et al.)
Read Time
14 min · ~3500 words
CHA₂DS₂-VASc Score Calculator
Interactive calculator with real-time scoring, clinical interpretation, and treatment recommendations.
Open CHA₂DS₂-VASc CalculatorFull Step-by-Step Guide
14 min · with embedded calculator
ESC 2019 PE Guidelines (Konstantinides et al.)
How to Calculate Wells Score for PE — Pulmonary Embolism Diagnosis Guide
The validated pre-test probability tool for suspected pulmonary embolism. Complete D-dimer decision guide, age-adjusted thresholds, PERC rule, YEARS algorithm, and ESC 2019 PE severity classification.
Key Clinical Points
- Wells ≤ 4 (PE unlikely) → D-dimer first; Wells > 4 → CTPA directly
- Age-adjusted D-dimer: age × 10 μg/L for patients ≥ 50 years
- PERC rule eliminates D-dimer in very low-risk patients (< 15% suspicion)
- YEARS algorithm reduces CTPA by ~14% vs standard Wells
- Haemodynamically unstable → empiric treatment, do not delay for scoring
Dr. Marcus Chen
Emergency Medicine Consultant
Score at a Glance
Score Range
0 – 12.5
Specialty
Emergency MedicineGuideline Reference
ESC 2019 PE Guidelines (Konstantinides et al.)
Read Time
15 min · ~3750 words
Wells Score for PE Calculator
Interactive calculator with real-time scoring, clinical interpretation, and treatment recommendations.
Open Wells PE CalculatorFull Step-by-Step Guide
15 min · with embedded calculator
Quick Reference — All Scores
At-a-glance summary of every score covered in this hub, with direct calculator links.
| Score | Primary Use | Key Threshold | Calculator |
|---|---|---|---|
SOFA | Sepsis diagnosis + ICU organ dysfunction | ≥ 2 from baseline = Sepsis | Open |
CHA₂DS₂-VASc | AF stroke risk + anticoagulation decision | ≥ 2 = anticoagulate | Open |
Wells PE | PE pre-test probability + D-dimer vs CTPA | > 4 = PE likely → CTPA | Open |
qSOFA | Rapid sepsis screening outside ICU | ≥ 2 = high risk → full SOFA | Open |
HAS-BLED | Bleeding risk in AF anticoagulation | ≥ 3 = high risk, modify factors | Open |
PERC Rule | Exclude PE without D-dimer in low-risk | All 8 negative = PE < 2% | Open |
432+ Clinical Calculators
Covering 30+ medical specialties
Beyond SOFA, CHA₂DS₂-VASc, and Wells PE — explore our complete library of evidence-based calculators across cardiology, nephrology, neurology, oncology, and more.