Blood Donations and Transfusions What is your feeling about possibility of passing ME/CFS (or FM) via blood donations? The CFIDS Association did a survey that found 40% of responding ME/CFS patients had given blood in the past. On the other hand the percentage who had received transfusions was at or just a bit above the national average. Reply: I think that blood donations by CFS or any chronic illness patients are a bad idea. One Dutch study found that about 5-6% of CFS cases may have originally started with a blood transfusion.