An ABO Rh blood test is a laboratory test that is used to determine a person's blood type and Rh factor. The ABO blood group system is a classification system for human blood based on the presence or absence of certain antigens on the surface of red blood cells. There are four blood types in the ABO system: A, B, AB, and O. The Rh factor, also known as the Rhesus factor, is a protein that is found on the surface of red blood cells. People who have the Rh factor are considered Rh-positive, while those who do not have the Rh factor are considered Rh-negative.
The ABO Rh blood test is typically ordered to help ensure that a person receives the correct type of blood transfusion, as mismatched blood can cause serious reactions. The test is also used to determine a person's risk of developing certain blood disorders or to determine the possible cause of certain medical conditions. The test is performed on a blood sample taken from a vein in the arm.
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