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Today a colleague asked if I could donate some blood for an experiment. I said no problem and had 10 tubes of 4ml blood each taken. I have no problems with needles and am definitely not squeamish. I have had many blood tests in the past of similar or even higher volumes and have been fine. However today after just 40ml I felt light headed and collapsed, does anybody know of any reason why this could be?
I don't remember anything of the incident, I just woke up with a friend shoving a drink in my face, and am curious (and a little embarrassed) to find out why this could have happened. Is it ever normal to loose such a small amount of blood but have such a response?
Thanks
I don't remember anything of the incident, I just woke up with a friend shoving a drink in my face, and am curious (and a little embarrassed) to find out why this could have happened. Is it ever normal to loose such a small amount of blood but have such a response?
Thanks