Question: Why do we have to have blood tests, because I have had like 9 and they haven't got anything out of me, and my doctor calls me a vampire and says I have no blood! why is this???????? and also can things like anorexia effect your heart or other vital organs?

Cathal Breen answered on 15 Mar 2012:

Blood tests are really useful ways of finding out how things are working within your body. The blood is the transport system for the body and carries alot of useful material in it, communicating with all of the organs of the body. A blood test is requested if your doctor suspects you are unwell. Some people have a low blood pressure and blood volume and therefore they are difficult to get blood from. It isn’t always because there is something wrong with you,and you are definately not a vampire.
Anorexia is a very serious condition and it can affect all of the organs of the body such as the brain, kidneys, heart and muscles of the body. Because the person does not eat or eats too little there body tries to protect itself and break down components of the body to act as fuel. The easiest way to do this is to target the muscles.