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The American Society of Anesthesiologists (ASA) Physical Status Classification is a standardized 6-category system for assessing a patient's preoperative health status and physiological reserve. Developed in 1963 and revised multiple times, the ASA classification is used universally in preoperative risk stratification, resource allocation, informed consent discussions, and perioperative outcome research. It correlates with surgical mortality, postoperative complications, and length of stay.
ASA Physical Status Class
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