What is Rh factor and how does it classify the blood group?
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The Rh factor, also known as the Rhesus factor, is a protein found on the surface of red blood cells. It is an inherited trait determined by genetics. Individuals can either have the Rh factor (Rh-positive) or lack it (Rh-negative).
When it comes to classifying blood groups, the Rh factor is considered alongside the ABO blood group system. The combination of the ABO blood group (A, B, AB, or O) and the Rh factor (+ or -) results in eight main blood types: A+, A-, B+, B-, AB+, AB-, O+, and O-.
For example:
– Blood type A+ indicates that the person has type A blood with the Rh factor present.
– Blood type O- indicates that the person has type O blood without the Rh factor.
Knowing a person’s blood type, including the Rh factor, is crucial for blood transfusions to prevent adverse reactions between incompatible blood types.