Which of the following is NOT listed as a symptom of hyperphosphatemia?

• A. Hyperkalemia
• B. Soft tissue and vascular calcification
• C. Secondary hyperparathyroidism
• D. Renal osteodystrophy

Answer: (A)

High phosphate levels disrupt calcium–phosphate balance and drive the mineral bone disorder changes seen with kidney disease. Soft tissue and vascular calcification occur because the elevated phosphate raises the calcium–phosphate product, leading to precipitation in vessels and soft tissues. Secondary hyperparathyroidism develops as phosphate retention and relative hypocalcemia stimulate increased PTH secretion, which attempts to maintain calcium balance but contributes to ongoing bone and mineral disturbances. Renal osteodystrophy is the bone-related manifestation arising from chronic kidney disease, reflecting abnormalities in phosphate, calcium, and PTH that affect bone turnover and mineralization. Hyperkalemia, while it can be present in kidney disease due to reduced potassium excretion, is not a direct symptom of hyperphosphatemia and is not part of the typical symptom set attributed to high phosphate levels.