@blm1007blm1007 Here is what my pulmonologist said about looking for mucus plugs when I asked about the significance in my CT - she looks for them to see if I need to increase my airway clearance or other efforts.

The absence of plugs in my CT last winter led her to suggest I didn't need as much mucus-thinning medication (in my case, I use plain extended-release Mucinex) and we reduced it to once per day. Now we are in cold/flu season, and I seem to have a bit of mucus all day, so I am increasing it back to twice a day, and using my Aerobika once a day in addition to exercise to move the mucus. Fingers crossed, this will be enough because unless I get sick, my next CT isn't until a year from now (every 2 years to limit exposure.)