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The best way to evaluate this would be to get pulmonary function tests done.
It has been far too long for this to be pneumonia or a lower respiratory chest infection since your symptoms are subtle.
And you do not have fever.
The pulmonary function tests will evaluate your respiratory tract in detail. I would also suggest that you undergo chest physiotherapy and expectoration for the excessive sputum.
Chest physiotherapy can also be done at home. The best way is to take steam inhalations with menthol for 15 minutes, then a helper should do gentle percussion of the back and front of the chest for 15 to 20 minutes and afterwards you should forcefully cough out the sputum.
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Yes, there is monitor attached to a probe in which one is required to blow in.
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