The ASA Physical Status Classification (ASA PS) is a standardized system used by anesthesiologists to assess a patient's health status and perioperative risk before surgery.
Select Applicable Conditions
Check all conditions that apply to determine the ASA Physical Status classification.
How to Use the Anesthesia Risk Calculator
This anesthesia risk calculator helps estimate ASA Physical Status classification. Check all conditions that apply — the highest applicable class is the patient's ASA status.
ASA Classification Overview
ASA I: Normal healthy patient. ASA II: Mild systemic disease, no functional limitations. ASA III: Severe systemic disease with functional limitations but not immediately life-threatening. ASA IV: Severe systemic disease that is a constant threat to life. ASA V: Moribund, not expected to survive 24 hours without operation. ASA VI: Brain-dead organ donor.
FAQ
Is this anesthesia risk calculator free?
Yes, completely free with no signup required. This is a reference tool — actual ASA classification requires assessment by an anesthesiologist.
What is the ASA Physical Status classification?
The American Society of Anesthesiologists (ASA) Physical Status classification rates a patient's health status from I (healthy) to VI (brain-dead organ donor). It predicts perioperative morbidity and mortality risk.
What is the difference between ASA I and ASA II?
ASA I is a completely healthy patient with no organic, physiological, biochemical, or psychiatric disturbance. ASA II is a patient with mild systemic disease — for example, well-controlled hypertension, mild obesity (BMI 30-40), or well-controlled diabetes.
How is ASA classification used?
ASA status helps anesthesiologists communicate risk, plan anesthetic technique, determine monitoring needs, and allocate resources. Higher ASA class does not necessarily mean surgery is contraindicated, but it informs risk-benefit discussions.
Does ASA status predict mortality?
ASA status correlates with perioperative mortality risk: ASA I < 0.1%, ASA II 0.2-0.7%, ASA III 1.8-3.8%, ASA IV 7.8-23%, ASA V 9.4-51%. These are population averages — individual risk depends on many factors.