23rd May 2025

A 36-year-old male has been experiencing low mood, weight gain, rounding of his face over the last few years.

A 36-year-old male has been experiencing low mood, weight gain, rounding of his face over the last few years. His GP recently diagnosed tinea versicolor infection. His medication history is positive for taking carbamazepine for psychosis. 

What is the best first-line investigation to use to establish the most likely diagnosis?

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