2nd August 2023

A 26 year old man presents with a 4 day history of foul-smelling diarrhoea and crampy abdominal pain.

A 26 year old man presents with a 4 day history of foul-smelling diarrhoea and crampy abdominal pain. He was in Ethiopia visiting family 3 weeks ago. He is otherwise fit and well, with no past medical history. A stool sample is taken, the stool looks pale and ‘fatty’.

What is the investigation of choice to confirm the diagnosis?

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