5th January 2024

A 60-year-old man with known COPD on regular Budesonide and Formoterol fumarate inhaler with PRN Salbutamol presents with gradually worsening reduced exercise tolerance over the last 6 months.

A 60-year-old man with known COPD on regular Budesonide and Formoterol fumarate inhaler with PRN Salbutamol presents with gradually worsening reduced exercise tolerance over the last 6 months. Which investigation would be most helpful in assessing the severity of his COPD?

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