THIS write-up by George Durkee is well worth being considered as a rough guideline/checklist. If I had known this info (I had never even heard of HAPE, HACE, & Hypoxia) on my group hike with the sick hiker, I would have been more equipped to make a rational decision{s}.
Up until recently, I thought that most of my responsibility to myself and others on the mountain was to be fit. If I was fit and strong, than most potential problems/liability could be avoided. Wrong. I found that by being fit-- but ignorant -- I RAISED my potential for trouble, due to the fact that I could go farther and be hampered by bad judgment in out of the way places.
SO much to learn.
b