I have discovered, through trial and vomit (and multiple research projects that have dragged me into them), that I can give three vials of blood easily, start to feel nauseated on four and throw up should people be foolish enough to continue (say 6-7ml/vial=24-28ml max). This is why I don't give blood. There's no point if the blood bank people have to take the blood bag off, throw it away because its not full and then clean up my vomit. Waste of their time, waste of my time - and lunch.
I haven't given more than one vial of blood at a time for a few years but today I gave four vials of blood for a Q fever research project (as I have been vaccinated against Q fever and am a conveniently close research subject). I wouldn't have volunteered if they were going into dangerous five vial territory. Fine through vials 1-3, queezy about two seconds into vial 4. Afterwards I had to go have a sit down, a drink and some fruit and nut mix. I'm told I went pale. I'm still feeling vaguely off.
Strangely enough I don't have low blood pressure (dead normal really). Yet, should anyone (secretly and without my knowledge) start siphoning me, my body tells me pretty quick smart and at the same volume each time.
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