But those are factors I'm sure any person has common sense to rectify. The vials they put your blood in already contain some kind of liquid that I'm sure sustain any possible yeast in the blood. Regarding live blood cell analysis, this is even used by conventional doctors but not for the purpose alternative doctors use it for. Besides, they say that if you have any yeast in your blood, you'd be in critical condition. My doc says I have yeast in my blood but I feel fine.