ASA Classification Principles

Core Principles

The American Society of Anesthesiologists (ASA) classification is based on a patient's physical health status and systemic disease burden, not chronological age 1
The ASA classification system ranges from ASA I (healthy patient with no systemic disease) to ASA VI (brain-dead organ donor) 1
Age is explicitly excluded as a criterion for ASA classification, and a patient's age does not automatically determine or increase their ASA class 1

The classification is determined by the presence of systemic disease, with none indicating ASA I, mild indicating ASA II, and severe with functional limitations indicating ASA III 1
The severity and control of existing conditions, such as poorly controlled diabetes, can elevate the ASA classification 1
Functional limitations caused by disease states are also considered in determining the ASA class 1
Specific health factors, including smoking status, alcohol use, obesity, and chronic conditions, are taken into account in the ASA classification 1

The American Society of Anesthesiologists recommends avoiding automatic upgrades of ASA class based solely on advanced age, and instead focusing on the patient's actual health status, comorbidities, and functional capacity 1
Preoperative testing guidelines may include age thresholds, but these are separate from the ASA classification criteria, as noted by the American Academy of Family Physicians 2, 3