Medical protocol is not the same as law. In most areas of the United States, it would take a Police Officer to take a conscious (and competent) adult anywhere in which they refuse to go. Trying to do otherwise would likely result in being at the bad end of a civil lawsuit.
This is actually backed up by the US Constituion per the Cruzan v. Director, Missouri Department of Health case in 1990. Competent adults have the right to refuse medical treatment per the Due Process Clause. Certainly this allows the argument to focus on whether the particular adult in question is “competent” at that moment in time or not. Having a BG of 75 absent any other symptoms would not likely be enough to satisfy this ruling from the US Supreme Court.