PTH and hyperphosphatemia: In hemodialysis patients, hypocalcemia has been reported as a complication of extreme hyperphosphatemia, low dialysate calcium, abrupt reduction in the parathyroid hormone concentration ([PTH]), antiresporptive therapy with denosumab, and iron chelation with deferasirox.1, , , , -6 This report describes a patient with transient hypocalcemia that could not be attributed to recognized causes.