I have heard that there should be slight decrease in peakflow between morning and night, but no clarification on what that means. So what is a normal difference between PF for morning and night? Do they mean by ten or fifteen or twenty? My PF tends to jump around within the 550-590 range so one day may be 590 Morning and 590 evening. Or it might go 590, 560 or 580, 550.
I know my asthma is not well controlled--I am just trying to get an idea of what is "normal" so that I have something to aim for.