An autoagglutination is the clumping together of an individual's red blood cells by his or her own serum due to being coated on the surface with antibodies.
formalization
Instead of using antisera for blood grouping , pooled known RBCs are used. the process is serum typing.so serum of patient whose Rbcs are auto aggluting is used.
Rouleaux formation is the stacking of red blood cells like a roll of coins, often seen in conditions like multiple myeloma. True agglutination is the clumping of red blood cells due to antibody-antigen interaction, such as in blood typing reactions. The key difference is that rouleaux formation involves cells stacking on top of each other, whereas true agglutination involves cells clumping together.