Keep It Off????

Hey everyone. I've got BCBS of TN and before they approve me they require that I lose 10% of my body weight. Just curious here, but once I lose the 10%, am I required to keep it off until surgery? Do they continue to follow up with it? What about in the event of an appeal? I'm looking to hopefully get approved for the VSG and I'm working towards the 10% and I was just wondering.