Endocrinology Q 28

A 45-year-old man is evaluated for anorexia, dizziness, and weakness. He was discharged from the hospital 5 days ago after transsphenoidal pituitary surgery for a pituitary macroadenoma abutting the optic chiasm. His postoperative course was uneventful, and his postoperative hormone evaluation was normal; he did not require any hormone replacement. He denies any polyuria or increase in thirst. He takes no medications.

On physical examination, vital signs and physical examination are normal.

Which of the following is the most appropriate diagnostic test to perform next?

A Antidiuretic hormone testing

B MRI of the pituitary

C Serum sodium measurement

D Thyroid-stimulating hormone measurement

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