Blood Group
There are 4 main blood groups – A, AB, B and O. Blood group tests are used during pregnancy to confirm which of the 4 main blood groups you belong to and whether you are “Rh” positive or negative in each group (i.e. whether specific antigens can be found on the surface of your red blood cells). Pregnancies where the mother is Rh-positive and the baby is Rh-negative (or vice versa) require special care to prevent problems during labour.
