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Preoperative grading

A commonly used grading system is that described by the American Society of Anaesthesiologists (ASA), in which patients are allocated to one of five categories. The scoring system allows easier communication between anaesthetists and is a useful research tool. However, it gives only limited prognostic information about the chances of an individual surviving an operation. Significant factors (including the type of procedure, a history of difficult intubation and of obesity) are not included in the classification.

Preoperative grading system of the ASA:

ASA I Healthy patient

ASA II Mild systemic disease, no functional disability

ASA III Moderate systemic disease, functional disability

ASA IV Severe systemic disease, constantly life-threatening

ASA V Moribund patient, unlikely to survive 24 hours with or without an operation


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	Preoperative grading A commonly used grading system is that described by the American Society of Anaesthesiologists (ASA), in which patients are allocated to one of five categories. The scoring system allows easier communication between anaesthetists and is a useful research tool. However, it gives only limited prognostic information about the chances of an individual surviving an operation. Significant factors (including the type of procedure, a history of difficult intubation and of obesity) are not included in the classification. Preoperative grading system of the ASA: ASA I Healthy patient ASA II Mild systemic disease, no functional disability ASA III Moderate systemic disease, functional disability ASA IV Severe systemic disease, constantly life-threatening ASA V Moribund patient, unlikely to survive 24 hours with or without an operation
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