All above is excellent advice.

One of my general rules for work is to not let the boss get blind-sided by something you know but did not tell him.

In my experience as both a boss and worker, it always seems to work out better if the boss knows about something like this up front. If he doesn't, and something happens, then it sounds like an excuse. I've heard most of them, and they seldom ring true when you first hear about it after the fact.

Going in with some documentation (e.g. a letter from the doctor) and saying words to the effect of "hey, I don't think there will be a problem, but thought you should know..." will probably be the best approach.


Good Luck