when rhd antigens on red blood cells are exposed to an individual with rhd- status, high-frequency of igg anti-rhd antibodies will be developed in the rhd- individual's body. the antibodies then attack red blood cells with attached rhd antigens and lead to the destruction of these cells. this condition is known as a haemolytic reaction. the destruction of red blood cells releases haemoglobin to the bloodstream. haemoglobin may be excreted through urine, causing haemoglobinuria. the sudden release of haemoglobin will also pass through the liver and be metabolised into bilirubin, which in high concentrations, accumulates under the skin to cause jaundice. liberation of blood cell debris into the circulation will also cause disseminated intravascular coagulation.