How to Determine Your Blood Type: 7 Simple Methods
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O-positive (O+) Blood Type
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
A Third of Americans Don't Know Their Blood Type. Here's How to Learn Yours
How to Determine Your Blood Type: 7 Simple Methods
Blood types
The Importance of Knowing Your Blood Type: 3 Methods to Identify Yours - CNET
Everything (and then some) about blood types