<prompt> A 50 year old man with history of recurrent renal stones and peptic ulcer disease. Urine examination revealed the following findings: He has been taking PPI as prescribed but to no avail. He has presented to emergency with chief complains of difficulty in peripheral vision. Which of the following laboratory workup is required in the evaluation of this patient?GastrinPTHProlactinAll of the above.  <response>: Urine examination reveals calcium oxalate stones CT scan: pituitary macroadenoma. Recurrent calcium oxalate stones so hyperparathyroidism Refractory PUD is so Zollinger Ellison disease Visual defects with CT findinds is so pituitary adenoma The above constellation is suggests diagnosis of MEN 1. Therefore, gastrin ZES, prolactin Pituatry adenoma and PTH hyperparathyroidism needs evaluation. 