The RH Antibody-Titres test is a blood test used to determine the presence and amount of antibodies against the Rh factor in the blood. The Rh factor is a protein that can be found on the surface of red blood cells, and people are classified as either Rh positive or Rh negative based on its presence. When a Rh-negative individual is exposed to Rh-positive blood, their immune system may produce antibodies against the Rh factor, which can cause problems during subsequent pregnancies or blood transfusions. The RH Antibody-Titres test is often performed during pregnancy to identify women who may be at risk for Rh incompatibility with their fetus. The test can also be used to monitor the level of Rh antibodies in people who have received multiple blood transfusions or who have undergone a bone marrow transplant.