Anesthesia Risk Assessment Calculator
ASA Physical Status Classification
Determine ASA class and estimate perioperative mortality risk.
years
kg/m²
Formula
Adjusted Mortality = Base_Mortality(ASA_Class) × Emergency_Factor × Age_Factor × BMI_Factor × Smoking_Factor × Surgery_Factor. Base rates: ASA I=0.03%, II=0.2%, III=1.8%, IV=7.8%, V=25%.
Frequently Asked Questions
What is the ASA Physical Status Classification?
The ASA (American Society of Anesthesiologists) Physical Status Classification is a system for assessing patient fitness before surgery. It ranges from ASA I (healthy) to ASA VI (brain-dead organ donor), with an 'E' suffix for emergency cases.
How does the ASA class affect anesthesia risk?
Higher ASA classes correlate with increased perioperative morbidity and mortality. ASA I patients have a mortality rate of approximately 0.03%, while ASA V patients have rates around 25% or higher. Emergency status roughly doubles the risk for any class.
What factors beyond ASA class affect anesthesia risk?
Additional factors include the type and duration of surgery, the patient's airway anatomy, BMI, cardiopulmonary status, renal function, medications, recent food intake, and the experience of the anesthesia team.