Oh man, I knew this was coming but it's so very . . . very . . . stupid. It's better to say than not.
"Doc, I know that there are various tests, samples, and so on you'll need to do. It's not like I need to sign a consent form or anything but a few things before we do this. First, from years of medicals to keep my press accreditation, I've one good vein in my right arm so any bloods'll have to come from there. Trust me you'll spend longer trying to find another than it'll take waiting on this" nodding briefly at his arm "to heal. Also, just to be on the safe side, if you're gonna be taking a sample of the scar . . ." pausing to sigh for a moment ". . . as silly as this sounds if there is a chance that the scar can 'feel' anything I'd rather let it know that it's alright, just a test, nothing to worry about. So even if I can't feel this" he pokes a finger into the scar, pushing quite hard, then releasing "is there any way to numb it? Lastly, got an ashtray?" he nods to the burned out cigarette in the holder.