I certainly remember being told that as a child Not former! I'm not sure if it's anywhere in writing ..I imagine there is! I'll have to see if I can dig it out somewhere. There was so many crazy stories told about blood transfusions.
Now I understand JW medical staff have been told not to administer it, let alone prescribe it. They have Bethel doctors & nurses. If they continue with that ruling they won't have any in a few years because such a ruling will prohibit any one training as medics in future🤷♀️