Which laboratory results should the nurse closely monitor in a client who has end-stage renal disease (ESRD)?

A. While monitoring blood pressure, heart rate, and temperature is important for overall health assessment, they are not specifically indicative of end-stage renal disease (ESRD). B. Leukocytes, neutrophils, and thyroxine are not directly related to renal function or the complications of ESRD. C. Clients with ESRD are at risk for electrolyte imbalances, including hyperkalemia, hypocalcemia, and hyperphosphatemia, so monitoring serum potassium, calcium, and phosphorus levels is crucial. D. Monitoring erythrocytes, hemoglobin, and hematocrit levels is important for assessing anemia, which is common in ESRD, but it's not the most critical parameter to monitor compared to electrolyte imbalances.