The big one, that when a doctor examines you, it’s just a snapshot in time. In five minutes you could sound completely different.
That you can have great lung capacity when healthy but still have really severe asthma.
That how your chest sounds sometimes tells you little about the severity of your asthma flare.
After all this time and many hospitalizations, I still don’t have an action plan.
And especially, LABAS artificially prop up your peak flow. That’s what they do and why they help. But it means that the green/yellow/red zone thing is completely useless for judging your condition. Instead, pay attention to how hard you’re working to breathe. Watch your heart rate (get a pulse ox). The higher your heart rate is, the harder your heart is working to keep your body oxygenated.