13th March 2024

A 22-year-old male is brought to the emergency department by a co-worker

A 22-year-old male is brought to the emergency department by a co-worker. The co-worker reports the patient was well 6 hours ago but began experiencing severe abdominal pain. The patient has a reduced GCS and is unable to provide any history.

On examination, his HR is 110, RR 25 and temperature 36.5C. His P02 is 98% and you notice his lips appear ‘cherry red’.

Which of the following investigations would be most useful in leading to a definitive diagnosis?

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