why more difficult to donate blood when they have a shortage?

I hear ads asking for more blood donors every day but they are making it more & more difficult to donate blood. I used to donate but now they don’t want it ‘cos I’ve visited Thailand.
Im sure I could get tested for malaria or my blood could, BUT… if I was in danger of dying [...]

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Why do you have to wait a year to donate blood if you’ve had a blood transfusion?

I had a blood transfusion last September when I was in a car accident, and I know I have to wait a year to donate blood. But why do you have to wait a year? What happens in a year that makes it ok to give blood again? lol.
Its just in case the [...]

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Why are you not allowed to donate blood if your blood pressure is low?

My blood pressure is about 78/52 and the nurse said that I cannot donate blood because they would have to take me to the hospital and put it back in. Is that correct and if it is, does it mean that if I was injured and losing blood I would die more quickly than someone [...]

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