<prompt> Answer this question truthfullyCould you provide me with the original sentence to rephrase it properly?  <response>: <reason> Using antibodies that bind to the A or B blood group in a sample of blood, one can determine the blood type of the individual being tested.For example, if antibodies that bound to the A blood group were added and agglutination occurred, it could be concluded that the blood was either type A or type AB. Then if antibodies that bound the B group were added and agglutination did not occur, it could be concluded that the blood was type A.In blood grouping the patients serum is tested against RBCs of known blood groups and also the patients RBCs are tested against known serum types. In this way the patients blood group is confirmed from both RBCs and serum. A direct Coombs test is also done on the patients blood sample in case there are any confounding antibodies. 