Question

what do you mean by Rh factor

Answer 1

Rhesus (Rh) factor is an inherited protein found on the surface of red blood cells. If your blood has the protein, you're Rh positive. If your blood lacks the protein, you're Rh negative.

Rh positive is the most common blood type. Having an Rh negative blood type is not an illness and usually does not affect your health. However, it can affect your pregnancy. Your pregnancy needs special care if you're Rh negative and your baby is Rh positive (Rh incompatibility). A baby can inherit the Rh factor from either parent.

Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Your health care provider will recommend a blood type and Rh factor screening test during your first prenatal visit. This will identify whether your blood cells carry the Rh factor protein.