ABO and Rh Blood Types

Blood types from left to right: A+ B- AB+ O-
Note the agglutination (clumping) in both the A and Rh wells in the 1st tray; agglutination in only the B well in the 2nd tray; agglutination in all three trays in the 3rd tray; and no agglutination in any wells in the 4th tray.

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Updated: 12 February, 2004
Created and maintained by J. Ellen Lathrop-Davis, All Rights Reserved