1st April 2022

A 50-year-old man attends A&E with a 1-hour history of sharp, severe pain in the right flank, nausea and vomiting

A 50-year-old man attends A&E with a 1-hour history of sharp, severe pain in the right flank, nausea and vomiting. He is pyrexial. The SHO is worried about obstructive pyelonephritis due to renal calculi.

Which investigation would be most appropriate to confirm the diagnosis?

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