The Rh factor is a type of protein that's usually found on red blood cells. When you have this protein, you’re considered Rh positive. About 85% of people are Rh-positive. The rest are Rh-negative.

If the blood of a pregnant woman is rhesus-negative (Rh-negative) and the blood of the foetus is rhesus-positive (Rh-positive), the woman may develop antibodies, which can cause severe harm to ...

Please provide your email address to receive an email when new articles are posted on . Few participants undergoing first trimester abortion had elevated fetal red blood cell counts. Not administering ...