A few: Being o negative makes you the "universal donor" this means that very few people would react to your blood and would make you a very popular donor at the blood bank. In pregnancy, if the fetus has a different blood type, it adds an increased risk of blood type incompatibility with the fetus- although this is easily remedied by your OB through the use of Rhogam vaccine during pregnancy.
Answered 9/18/2017
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