Is it normal to have (at least temporarily) higher blood pressure than normal after donating blood? What is the normal effect?
by 
MvL
ANSWERS: 2
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good question!! I would say no the body itself should be able to compensate for the loss of blood. Shoot that's a really good question, I'm not certain on the answer to it. I could also see the heart working a little bit harder than usual for a short period until the normal compensatory effect kicks in, which should be almost immediately.
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The body has to increase the pressure at first to compensate for the lack of volume. If the pressure stayed the same it would have a harder time reaching your brain, due to less volume.
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