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American Society of Anesthesiologists (ASA) Physical Status Scale
Class I
Minimal Risk
Normal healthy animal, no underlying disease
Class II Slight risk, minor disease present
Animal with slight to mild systemic disturbance, animal able to compensate
Examples: neonate or geriatric animals, obesity
Class III
Moderate risk, obvious disease present
Animal with significant systemic disease or disturbances
Examples: anemia, moderate dehydration, fever, low-grade heart murmur
Class IV
High risk, significantly compromised by disease
Animal with severe systemic disease or disturbance
Examples: severe dehydration, shock, uremia, toxemia, high fever, uncompensated systemic disease
Class V
Extreme risk, moribund
Surgery often performed in desperation on animal with life threatening systemic disease
Examples: extreme shock or dehydration, terminal malignancy or infection, advanced systemic disease (renal failure, hepatic failure, cardiac failure, etc.), severe trauma
"E" denotes emergency and can be assigned to any class
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