A 49-year-old house insulator presents with an 11-month history of fatigue, dyspnoea, and a non-productive cough.
A 49-year-old house insulator presents with an 11-month history of fatigue, dyspnoea, and a non-productive cough. On examination, there are bi-basal crackles.
Which of the following is likely to reveal the diagnosis?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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