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Why would a doctor not tell you your blood type, or at least why don't they give this information as a standard procedure? I am 49 years old and have no idea

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How did my blood type go from O- to O+? I have records showing my blood type was O- but in 2012 it switched to O+. No blood transfusions at this point

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How to Determine Your Blood Type: 7 Simple Methods

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