The American Society of Anesthesiologists (ASA) Physical Status classification system was initially created in 1941 by the American Society of Anesthetists, an organization that later became the ASA.
The purpose of the grading system is simply to evaluate the degree of a patient's "sickness" or "physical state" before selecting the anesthetic or before performing surgery. Describing patients' preoperative physical status is used for recordkeeping, for communicating between colleagues, and to create a uniform system for statistical analysis. The grading system is not intended for use as a measure to predict operative risk.
The modern classification system consists of six categories, as described below.
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