American Society of Anesthesiologists (ASA) Physical Status Scale |
ASA I
Minimal Risk
Normal healthy animal, no underlying disease
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ASA II
Slight risk, minor disease present
Animal with slight to mild systemic disturbance, animal able to compensate
Neonate or geriatric animals, obese
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ASA III
Moderate risk, obvious disease present
Animal with moderate systemic disease or disturbances, mild clinical signs
Anemia, moderate dehydration, fever, low-grade heart murmur or cardiac disease
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ASA IV
High risk, significantly compromised by disease
Animals with preexisting systemic disease or disturbances of a severe nature
Severe dehydration, shock, uremia, or toxemia, high fever, uncompensated heart disease, uncompensated diabetes, pulmonary disease, emaciation
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ASA V
Extreme risk, moribund
Surgery often performed in desperation on animal with life threatening systemic disease
Advanced cases of heart, kidney, liver or endocrine disease, profound shock, severe trauma, pulmonary embolus, terminal malignancy
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"E" denotes emergency
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