I could at times give a sputum sample but it is difficult to be able to expectorate completely most of the time. And even now, it is not the huge amount of mucus some people talk about. My next appointment is in August. My doc was doing pulmonary function tests alternating with CT scans for 2 years and they both remained stable. Have had nothing since last August now due to those results and will see what he says this August . Being on this forum encourages me to keep up the airway clearance faithfully. Even though I don't have the diagnosis of MAC I have adopted some of the precautions on this forum for prevention purposes.