2nd August 2023

A 46 year old patient with HIV presents with a 4 day history of watery diarrhoea and abdominal cramps.

A 46 year old patient with HIV presents with a 4 day history of watery diarrhoea and abdominal cramps. She has been non-compliant with her antiretroviral therapy recently due to depression.

What is the investigation of choice to confirm the diagnosis?

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