Configure Patient & Presentation
How it works
Standard differential diagnosis lists rank conditions by symptom frequency alone — the same list whether you're in Lagos or London. This tool calibrates that list using WHO GHO 2022 incidence data for your selected region.
Posterior ∝ P(symptoms | disease) × P(disease in region)
Malaria ranks #1 for "fever + rigors" in Africa because its local incidence of 23,000/100k dwarfs its European rate of 2/100k — a 10,000× difference that completely reshapes the differential.