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.

The rhesus factor, or Rh factor, is a protein that may be present on the surface of red blood cells (RBCs). If RBCs contain the Rh antigen, they are Rh-positive, and if not, they are Rh-negative. It ...

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 ...

The new noninvasive test, using a blood sample of the pregnant woman, is as reliable as the conventional test using a blood sample of the newborn. Studies on benefit and harm are still lacking. If the ...