You searched for: “autoagglutination
autoagglutination (s) (noun), autoagglutinations (pl)
A nonspecific agglutination or clumping together of cells: Autoagglutination can take place with bacteria and erythrocytes due to physical-chemical factors.

Autoagglutination is the agglutination or spontaneous clumping together of an individual's red blood cells in his own serum as a result of a certain autoantibody.