23rd May 2025

A 32-year-old lady had a recent parathyroidectomy due to persistent hypercalcemia.

A 32-year-old lady had a recent parathyroidectomy due to persistent hypercalcemia. She has been experiencing aching in her bones and joints, long-standing anaemia and persistent hyperkalaemia. She usually has haemodialysis three times a week. Post-operatively, she is having trouble with a tingling sensation in her upper arms and intermittent spasms. Aside from that, she has been passing urine more frequently, even at night. Her blood test showed her adjusted calcium was 1.6, urine osmolality was 473mOsmol/kg. What is the cause of her polyuria?

Select the SINGLE most appropriate option from the list below. Select ONE option only.