A client who performs peritoneal dialysis at home calls the nurse at the dialysis clinic to report pain and tenderness in the abdomen and vomiting since yesterday. Which assessment question is most important for the nurse to ask the client?

Brief introduction: Care of a client performing peritoneal dialysis at home involves monitoring for early signs of peritonitis, a serious complication caused by infection of the peritoneal membrane. Clinical indicators include abdominal pain, tenderness, nausea, vomiting, and changes in the appearance of dialysis effluent. Prompt recognition of infection-related changes in the dialysate is critical because peritonitis can rapidly progress to systemic infection if not treated early. Rationale: A. Asking about fever is important because fever may indicate infection, but it is not the most specific or immediate indicator of peritonitis in peritoneal dialysis. Some clients may not mount a strong febrile response in early infection stages. Therefore, relying solely on temperature changes may delay recognition of the condition. B. Assessing the appearance of the peritoneal dialysis effluent is the most important question because cloudy or discolored drainage is a hallmark sign of peritonitis. Infection causes an influx of white blood cells and fibrin into the dialysate, changing its clarity. This finding, combined with abdominal pain and vomiting, strongly suggests peritoneal infection requiring urgent intervention. C. Asking about dietary intake is not directly relevant to the suspected complication. While gastrointestinal upset can be influenced by food choices, abdominal tenderness and vomiting in a peritoneal dialysis client more strongly indicate infection rather than dietary intolerance. This question does not prioritize the immediate safety concern. D. Asking when the last exchange was performed may provide useful routine information, but it does not directly assess for infection or complications. Timing of exchanges is important for dialysis adequacy but does not help identify peritonitis. The nurse should prioritize assessment of signs that indicate acute clinical deterioration instead.