11th April 2024

A 31-year-old female presents with a 3-month history of amenorrhoea to the endocrinology clinic.

A 31-year-old female presents with a 3-month history of amenorrhoea to the endocrinology clinic. She previously had regular periods since age 12 and recently has been suffering from milk leaking from her breasts. She has been on haloperidol for 4 months, and her baseline serum prolactin level was 120 mU/l (normal range <400 mU/l). A repeat prolactin taken 1 week ago was 1580 mU/l, and β-hCG test is negative. What is the most likely underlying cause for her symptoms?

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