According to the ASA Physical Status Classification System, what category applies to a patient with end-stage renal disease (ESRD) on regular scheduled hemodialysis?

According to the ASA Physical Status Classification, a patient with ESRD undergoing regular scheduled dialysis is classified as ASA III — a patient with severe systemic disease that is not immediately life-threatening but places substantial functional limitations. ASA III examples include ESRD on dialysis, controlled diabetes with complications, COPD, and morbid obesity. ASA IV would apply to ESRD NOT undergoing dialysis (uremia, volume overload) — a constant threat to life. This distinction is important: a dialysis patient who is regularly managed is ASA III, not ASA IV.