4th September 2020

A 45-year-old ex-smoker with a previous 20-pack-year history has come into his GP practice

A 45-year-old ex-smoker with a previous 20-pack-year history has come into his GP practice complaining of persistent chronic cough with regular sputum production. He has been treated previously for an infection with amoxicillin a few months ago, but the cough has not subsided. His GP makes the diagnosis of COPD. What additional test is required for confirmation of the diagnosis?

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