I may not be 100% correct. The the intent of the ROM is to see what you can to do day in day out. There is a difference between going all the way once (or several times with in 5 minutes.) Compared to being able to do the same measurement several times a day through out the week. When your ROM is done, if not already, the PT will note only how far you can go, additionally he/she should state if you were limited by pain/ guarding exctra.
When I had my ROM done for my PEB it was done wrong and now I am having to go to the FPEB. I was asked to go as far as I could, and I did (and I was off my meds). But when done I was in tears, had to take perk, and had a worker help me walk to my vehicle (as I was in tears and a hand rail only went part way). The next day, a tuesday, I was placed on quarters for 48hrs, once off that I was placed on quarters for another 24 hrs, and I think I was placed on quarters on Friday also all due to my back being flared up. The numbers that I achieved from that ROM equals 20%. Tell me, do you think that is an accurate representation of a functional ROM? Something to think about.