Blood Type and Crossmatch - Health Encyclopedia ...
Blood typing, crossmatching. What is this test? This is a set of tests that looks for harmful interactions between your blood and donor blood. The tests are done before a blood transfusion. Blood typing is the first step. This test finds out if you have blood type A, AB, B, or O. Your blood is also tested to find out if your Rh type is negative or positive.
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