Re: Wife Seises when giving blood
There is such a thing as a vasovagal syncope seizure. It's not a "real" seizure, there's no abnormal electronic activity in the brain, it's just the sudden and drastic drop in blood pressure.
Definitely, make sure she's lying down with her legs elevated before they start. That helps keep blood pressure up. Bands on the legs do the same thing. Drinking water and eating salt beforehand can also help prevent fainting. If they want a fasting blood glucose test while she's pregnant, that's too bad, they can't have it.
Have the doctors caring for her pregnancy seen this from her before? I would make sure that, if they haven't, they get documentation from someone who has.