The life is in the blood for sure, but the main Scriptural injuctions dealing with it are for forbidding to eat it and the fact that the life is in the blood is the reason.
There’s nothing in Scripture that I could see would prevent testing. Transfusions-I could see someone’s reasoning, but not testing.
What’s she going to do if her kids cut themselves? Or they witness a bad accident and need to help? Do they not eat meat because it has blood in it, no matter how hard you try to get it out?
Good questions, all.