There are four major blood groups - A, B, O and AB and these groups are either Rh + or Rh -. Only blood of the same group is compatible for transfusion and even then the blood of donor and recipient of same group has to be directly cross matched before transfusion. the blood group of family members is usually the same. All young men in good health can donate blood every three to four months. Only 250-300 c.c is taken out of the total of 5,000 to 6,00 cc in the body. People who have jaundice should not donate blood for transfusion as there is danger of the recipient developing jaundice.
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