A patient with a moderate or severe systemic infection (e.g. pyometra) is classed under which ASA grade?

• A. II or 2
• B. III or 3
• C. IV or 4
• D. V or 5

Answer: (B)

Understanding how ASA physical status categorizes preoperative health is key. The ASA system ranges from I to V, with an optional E for emergencies: I = healthy; II = mild systemic disease; III = severe systemic disease that limits activity but is not life-threatening at the moment; IV = severe systemic disease that is a constant threat to life; V = moribund and not expected to survive without the procedure.

A moderate to severe systemic infection represents significant systemic involvement. If the infection is present but not causing immediate life-threatening instability, it fits a severe systemic disease without constant threat to life, which is ASA III. If the infection were causing ongoing, critical instability or organ failure that threatens survival despite treatment, it would be ASA IV.

So for a case like pyometra with a moderate or severe systemic infection, ASA III is the best fit because it reflects substantial systemic disease without an ongoing, immediate threat to life at the time of assessment.