I've talked over the blood issue with my hubby. First of all dealing with the fractions. Why can we have fractions but not the main component... for instance leukocytes are found in breast milk and plasma is 55% of blood and 92% of plasma is water! Haemoglobin is now allowed yet it makes up 97% of the red blood cells dry content. Where is the sense?
Then I went to the account in Genesis 9 of the law given to Noah. It clearly states that if a man sheds another man's blood his own shall be asked back. However God was giving man animals to eat so he was permitted to kill them for food. Of course the case of a life for a life couldn't cover an animal's loss of life so instead he gave the command to pour the blood on the ground, recognising the life came from God and is being given back to God. In the case of giving blood for a blood transfusion or accepting a blood transfusion.. no life is lost! The scripture has been badly twisted.
It hasn't stopped him carrying his blood card everywhere but he could see the twisted understanding.