It is state specific which can make studying for the nclex frustrating. I'd be doing practice questions for class/nclex and get them wrong because their guidlines don't match up with what happens here in MI.
I just had to remember the key words- teach, assess, plan etc that are words that apply to only RNs. Your place of business should also have policies reguarding certain activities that are allowed to be delagated.
If you mean between nurse and PCA I have determined it has everything to do with the particular PCA and not much to do with policy . I am still trying to figure out after 10+ months what I can and can't ask other staff to do for me/pt.