AVTAA

1003 Felton Lane
Auburn, al 36830

(509)338-5205

www.avtaa-vts.org

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