Analysing Blood

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Tests carried out on blood can be used to determine if the blood is from a human or animal. Tests can also be used to determine the blood for a human. There are four human blood groups: A, B, , and O .


Blood types


The groups are distinguished by the markers, called , on the surface of blood cells.

Antibodies are contained within . The types of antibodies present in plasmas depend on the blood group.

To determine which blood group a blood sample belongs to, it is mixed with anti-A antibodies. Another sample is then mixed with antibodies. The results of the tests enable the blood group to be identified.

A sample of blood from Group A will when mixed with anti-A antigens. A sample of blood from Group B will clot when mixed with antibodies. A sample of blood from Group AB will clot when mixed with anti-A antibodies and when mixed with antibodies.