This Pain ASA Guide Tool is an independent online educational reference provided by Coastal Pacific Anesthesia, Inc. It is provided solely for general educational reference and is not intended or validated for clinical use, patient-specific evaluation, clinical decision-making, or use in the medical record. It is not affiliated with, endorsed by, or an official product of the American Society of Anesthesiologists (ASA).
Illustrative ASA category outputs are informational only; the underlying decision rules have not undergone formal clinical validation and do not replace independent clinical judgment, a comprehensive preanesthesia evaluation, or current ASA guidance. The treating anesthesia professional remains responsible for determining the appropriate ASA Physical Status classification, assessing procedural suitability, and making patient-care decisions.
Do not rely on its outputs to assign ASA status, assess readiness for anesthesia or surgery, order tests, select treatment, determine medical necessity, or make billing or reimbursement decisions. Content may be incomplete, outdated, or inaccurate and is provided without any guarantee of accuracy, completeness, or fitness for a particular purpose. No patient-clinician relationship is created by use of this reference. Do not enter protected health information (PHI) or patient-identifying details. A disclaimer does not waive legal duties or eliminate liability.
How ASA Physical Status categories are classified
The following is a simplified educational summary of the ASA Physical Status Classification System. These are overall patient classifications, not scores assigned separately to each diagnosis. The examples are illustrative, not exhaustive.
| Class | Definition | Illustrative examples |
|---|
| ASA I | Normal healthy patient | Healthy, nonsmoking, no or minimal alcohol use |
| ASA II | Mild systemic disease, without substantive functional limitations | Controlled HTN or diabetes; BMI 30–39.9; current smoker; mild lung disease |
| ASA III | Severe systemic disease | Poorly controlled HTN or diabetes; BMI ≥40; COPD; stable angina; ESRD on regular dialysis |
| ASA IV | Severe systemic disease that is a constant threat to life | Ongoing cardiac ischemia, severe valve dysfunction, symptomatic CHF, recent MI or stroke |
| ASA V | Moribund patient not expected to survive without the operation | Ruptured abdominal aneurysm, massive trauma |
| ASA VI | Declared brain-dead patient undergoing organ donation | Organ procurement |
Emergency modifier (E): Add E when delay in treatment would significantly increase threat to life or body part (e.g., ASA III E).
How the conditions in this app affect classification
Cardiovascular: Controlled HTN generally aligns with ASA II; poorly controlled HTN is an ASA III example. Stable CAD, CHF, arrhythmia, and prior stroke require assessment of symptoms, function and severity. Active ischemia, decompensated CHF or other life-threatening instability may support ASA IV.
Respiratory: Mild lung disease may fit ASA II; COPD appears among ASA III examples, with actual severity assessed clinically. OSA, oxygen use and obesity hypoventilation require assessment of hypoxemia, ventilatory impairment and underlying disease; they are not automatic ASA scores. A difficult airway is an anesthesia-planning concern, not automatically ASA III.
Metabolic and organ disease: Well-controlled diabetes and BMI 30–39.9 are ASA II examples; poorly controlled diabetes and BMI ≥40 are ASA III examples. CKD, dialysis, liver disease and frailty need assessment of systemic severity, complications and functional impact.
Chronic pain and implanted devices: Chronic or uncontrolled pain, long-term opioids, an intrathecal pump, or a failed spinal cord stimulator do not independently determine ASA III. Assess the underlying systemic illness, respiratory effects, withdrawal/overdose risk, and meaningful functional limitations. A malfunctioning pump may require urgent evaluation regardless of ASA class.
Multiple diagnoses: ASA classes are not additive. Several controlled ASA II conditions do not automatically equal ASA III; their combined systemic impact may nevertheless matter. The final class reflects the patient's overall condition at assessment.
Reference: ASA Statement on ASA Physical Status Classification System. Confirm the current official statement and institutional policy before clinical use.
For use by qualified healthcare professionals only.