8th July 2024

A 49 year-old man presents with increasing abdominal pain, nausea, and muscle weakness

A 49 year-old man presents with increasing abdominal pain, nausea, and muscle weakness. He reports a few week history of weight loss, though he is unsure of the extent of this. He also reports headaches and profuse, watery diarrhoea for the last 2 weeks, which is getting worse. Initially, he thought this was a result of something he had eaten.   Blood tests demonstrated a potassium of 2.3 mmol/L, bicarbonate of 14 mmol/L, as well as an acute kidney injury.

Which of the following would be the most likely investigation to identify the cause of this patient’s presentation?

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