Sorry Jean I have no knowledge of this at all. Hopefully somebody will be able to explain. Have you thought of asking the nurses on this site? I know,from what other people have said, that they are very helpful.
I spent a little time in the States and there was a lovely saying our neighbours had (more than one saying but I will save others for another time:))
If they did not understand what I meant they would say "Cripple that, and run it past me one more time"
I am sure that the nurses on here are used to explaining things to people,like us, who have very limited knowledge of medicine in a way that is easier to understand
I do hope you get some explanations of what it all means.
Take care and stay in touch Gillxx