20th July 2020

A 40-year-old male presents to the emergency department with sudden onset vomiting and abdominal distention

A 40-year-old male presents to the emergency department with sudden onset vomiting and abdominal distention. Past medical history includes Crohn’s disease, which he normally manages well under specialist care. On examination, his abdomen is diffusely tender and bowel sounds are high pitched on auscultation. 

Select the SINGLE most appropriate investigation to urgently request from the list below. Select ONE option only.