In CKD-MBD management, which laboratory parameter is commonly targeted to lower risk of vascular calcification?

• A. Calcium
• B. Phosphate
• C. PTH
• D. Ferritin

Answer: (B)

Phosphate control is the main lever used to reduce vascular calcification risk in CKD-MBD. When kidney function falls, phosphate clearance drops and serum phosphate tends to rise. This elevated phosphate combines with calcium, increasing the calcium-phosphate product, which can deposit in the walls of blood vessels and promote calcification. By lowering phosphate through dietary restriction, using phosphate binders (preferably non-calcium binders to avoid adding extra calcium), and ensuring adequate dialysis, you reduce the substrate that drives this calcification process. While calcium and PTH management are also important for overall mineral balance and bone health, phosphate reduction directly targets the pathway most linked to vascular calcification. Ferritin is not involved in this calcification risk.