MRCP2-1332

MRCP2-1332

An 80-year-old man with a history of localized squamous cell lung cancer presents to the Emergency Department with increasing confusion and peripheral muscle weakness. He reports feeling thirsty. Laboratory results show a hemoglobin level of 102 g/L, a white cell count of 12.1 x 10^9/L, and a platelet count of 167 x 10^9/L. His sodium level is 139 mmol/L, potassium level is 4.7 mmol/L, urea level is 6.2 mmol/L, creatinine level is 145 μmol/L, and calcium level is 3.2 mmol/L. His parathyroid hormone level is 1.9 pmol/L, which raises concern for pseudo hyperparathyroidism. After managing the acute hypercalcemia, what is the most appropriate long-term approach to treating the pseudo-hyperparathyroidism?