ASA physical status categories are most commonly encountered in small animal practice and guide anesthetic planning. Which option reflects this?

• A. ASA II, III, and IV only.
• B. ASA III, IV, and V.
• C. ASA I, II, and III (with III indicating some systemic disease); IV–V are high risk.
• D. ASA I and II only.

Answer: (C)

In anesthesia, ASA physical status is a simple way to summarize a patient’s overall systemic health to guide planning and risk assessment. In small animal practice, you’ll most often see patients classified as ASA I (healthy) or ASA II (mild systemic disease). When there is systemic disease that is present but not life-threatening, the patient is ASA III. Higher categories—ASA IV and ASA V—represent severe systemic disease that constantly threatens life or a moribund state, and these are encountered less frequently in routine cases.

So the choice that lists ASA I, II, and III, with ASA III indicating some systemic disease, and notes that IV–V are high risk, best matches how clinicians typically encounter and plan for anesthesia in small animals. The other options either emphasize only higher-risk categories or omit the commonly seen healthy or mild-disease cases, which doesn’t reflect everyday practice.