Blood Types.

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14.3 Blood Groups and Transfusions

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Presentation transcript:

Blood Types

Blood Types

Blood Types Blood cells have different markers on their surface. These markers are called antigens. Common antigens: A B Different combinations of these antigens result in different blood types.

Blood Types Another antigen of clinical significance is D antigen This antigen is used to identify the Rhesus factor (Rh) of the blood. Rh+ = presence of D antigen Rh- = lack of D antigen

Blood Types Along with antigens on the surface of red blood cells, the body contains specific antibodies dissolved in the blood. These antibodies bind to foreign blood and cause the blood to clump together. These antibodies attack foreign blood types (i.e. Type A blood has Anti-B antibodies)

Blood Types Summary of blood types and antibodies

Blood Types This means that people with Type B blood cannot receive a blood transfusion with Type A blood.

Blood Types Summary of Blood Type and Antibodies Only type AB blood has no antibodies against other blood types. The presence of antibodies presents a challenge for blood transfusion/donation. Video: Blood groups and antibodies http://www.youtube.com/watch?v=H4qkwW-Fl3E

Does not contain antibodies Blood Types Blood transfusion: Only red blood cells are transferred in a blood transfusion. The antibodies in the plasma are separated from the red blood cells with a centrifuge. Blood Centrifuged blood Contains antibodies Does not contain antibodies

Antibodies bind to the blood cells and cause them to clump Blood Types Type O recipient Blood transfusion: The antibodies in the recipient (the person receiving the blood) will attack other types of blood. Example: If Type A blood was given to a Type O recipient, the recipient’s Anti-A antibodies will attack the foreign blood and cause it to clump. A A Type A transfusion A Antibodies bind to the blood cells and cause them to clump

Blood Types Blood transfusion: Blood transfusions with the inappropriate blood type causes systemic blood clumping (agglutination) and potentially death. antibodies

Blood Types Blood transfusion:  Rh-complications A patient who is Rh-negative may have Anti-Rh antibodies, which can cause the blood to agglutinate. Example: A mother may be Rh-negative while her fetus is Rh-positive She MAY develop Anti-Rh antibodies if her blood becomes in contact with her baby’s blood.

Blood Types Blood transfusion:  Rh-complications If the Rh-negative mother develops Anti-Rh antibodies, then her next pregnancy may be terminated if her new antibodies reach her Rh-positive fetus.

Blood Types Blood transfusion game: Blood Typing Game