In eight weeks or so, when we try this again, we will go back to the other vein, which has served well for 35 years of blood donations. The first nurse today saw the needle marks from all those years and thought it should be retired. Not so.
This was an honest error--"it seemed like a good idea at the time. The nurses were very apologetic. No harm done, except possibly for a bruise on my arm. I will be back.