Hypovolemic shock after blood donation?

Is it possible for a healthy adult who donates 500 mL blood to get into the (compensated) shock with pale, cool and sweaty skin? I mean, does anyone know if this has actually happened to someone?

Also, is it any quick and reliable test to differ between hypovolemic shock and vasovangal syncope?
Symptoms of both seem to be similar

Authored By Jan Modric on Monday 18th November 2013

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Ruth Edmonds
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Medical Student - Kings College London
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Posted almost 7 years ago

Having donated blood myself, this is quite possibly one of the reasons that you are made to sit and have a drink immediately after donating blood. That said, the pre-donation checks including Hb are there to ensure that we are healthy enough to donate

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Luke Notsle
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Posted about 6 years ago

I tried to donate the other day got half way through and felt really weird started to have to breathe really deep and the nurse immediately stopped, by the time she stopped I was extremely light headed, really light grey and felt as if I was in the sho

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