Hi Jessy that is not quite right. Copd is usually diagnosed from a spirometry test and a chest X-ray should follow to confirm.
The peak and flow test is used to measure asthma symptoms and not copd.
Having said that in borderline cases it can be very difficult to distinguish between asthma and copd as many of the symptoms are the same.
In my case I had asthma for many years, then I had a spirometry and it confimed the presence of copd as well. But when I got better inhalers for it my lung function went up and the nurse said I was out of the copd range then and it was probably poorly controlled asthma which had caused the results.
I now do have mild copd though.
Sherry it sounds like your situation and you are most likely on the borderline. It's not great to have copd but it is to be diagnosed early as there is a lot you can do to stop it progressing much if at all. With a healthy lifestyle you can keep it at the mild stage for many years. Bear in mind though that with age the lung function does decline a bit naturally.
I have said this before on here and will say it again. My doctor said at my age (56 when diagnosed - am 62 now) then not to worry about it so much as something else would get me first ie old age! x