Thanks for reading
Sorry I didn’t made it clear in my read up
The Rhesus factor which are proteins is use for compatibility test In pregnancy , transfusion or donation
When I talk of compatibility I mean is the blood ok to be transfuse to a patient without hemolytic transfusion reaction
Same with a pregnant mother and her child if she is negative and her baby is positive if not detected to place her under the anti D antibody drug so that the mother child have no complications