The clumping together of red blood cells by the action of an antibody is known as:

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Agglutination refers to the clumping of red blood cells when they come into contact with an antibody that recognizes and binds to specific surface molecules on the cells. This is commonly used in blood typing and cross-matching to ensure compatibility between blood donors and recipients. Radioimmunology, serology, and clotting are related to different aspects of immunology, but do not specifically describe the clumping of red blood cells.

The Clumping Together of Red Blood Cells by the Action