Sometimes access to testing facilities is not immediately at hand, or there is insufficient time available to order a blood type test and cross-match in order to ensure accurate blood type matching before treatment is administered. While blood type testing will generally always be done in instances where a transfusion is required, this is not always possible. However, in life-threatening emergencies where substantial blood loss has occurred, time is of the essence in administering a transfusion. either blood of a different group or mismatched Rh factor) are exceptionally rare. With modern testing, transfusions using mismatched blood types (i.e. In these instances, it is imperative that the correct blood type be given. ![]() Knowing your blood type is important prior to surgery and in emergency medical situations where you may have lost a great deal of blood and require a life-saving blood transfusion. Why is knowing your blood type useful? Prior to surgery or in emergency situations If this antigen is present, your blood is referred to as rhesus positive (Rh+) or 'positive' and if it's not, then your blood type is rhesus negative (Rh-) or 'negative'.įrom ABO and Rhesus factor blood typing, the eight blood types are derived as follows: The blood groups are determined according to these as follow: Blood GroupĪnother element to blood typing is based on the absence or presence of the Rhesus (RH) factor or D-antigen (RhD) on the surface of the red blood cells. An individual with a certain blood type will thus develop antibodies against the antigens that they don't naturally have. If an antigen is identified as being ' foreign' these cells will be targeted by the immune system and destroyed.
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