[Expert Solution]: an elder adult female patient with 40 year…

an elder adult female patient with 40 year history of smoking presents in the clinic with complaints of progresive SOB over the pasat several years. She notes that her breathlessness is most pronounced when climbing staiaras or carrying groceries. she denies any chest pain chronic cough or significant sputum production. Pgysical examination reveals barrel chest and decreased breath sounds with prolonged expiration,. What would most likely finding on the diffusing capacity of the luins for carbon monoxide test