It is a complex process that requires good communication between the nephrologist, the dietitian, and the patient. It is important to recognize the treatment goals, which vary according to the stages of CKD. Serum levels of calcium, phosphorus, and intact PTH should be measured in all patients with CKD and estimated GFR <60 mL/min. The National Kidney Foundation K/DOQI guidelines provide frequency of measurements and goals for serum phosphorus and PTH according to CKD stage, listed below 14 (Table 2). The treatment of secondary hyperparathyroidism basically consists of a low phosphorus diet, phosphate binders, vitamin D derivatives, calcimimetics, and even parathyroidectomy.
The goal of the first step is to optimize the levels of serum phosphorus and calcium (within the recommended ranges, depending on stage of CKD). This can be achieved by dietary restriction and the initiation of phosphate binders (calcium acetate, sevelamer, or lanthanum). In CKD stages III and IV, ergocalciferol should be considered if the 25-hydroxyvitamin D level is <30 ng/mL.
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