Rhesus factor incompatibility , a leading cause of miscarriage! Rhesus Factor is an antigen that exists on the surface of red blood cells in most people (about 85% of humans). It is also referred to as Rh Factor. People who have the Rh have “positive” (+) blood types, such as A+, O+ or B+ are said to be rhesus Factor positive, while those who have the Rh “negative” (-) blood types, such as A–, O– or AB– are said to be rhesus factor negative . The “+” and “-” in front of the blood group is the Rhesus factor. Generally, we have A+, A–, B+, B–, AB+, AB–, O+ and O–. Rhesus factor is genetic in nature. It is inherited from the parents, emphatically the father. How does Rhesus Factor cause miscarriage? If a Rh– woman is impregnated by a man with Rh–, there wouldn’t be any problem. However, if a Rh– woman is impregnated by a man with Rh+, there would be a prob...