Harold Boots is a 70 year old male, who has a history of dia…

Harold Boots is a 70 year old male, who has a history of diabetes & hypertension. He presents to you with fatigue, malaise, pruritus, & complaints of  irritability & poor concentration. His testing shows a GFR < 10 ml/min, elevated BUN, creatinine & K, & anemia. You suspect: