What type of testing is performed when cells are mixed with antisera to identify blood type?

The process of mixing cells with antisera to determine blood type is known as serological testing. This type of testing relies on the principle of antigen-antibody reactions, where specific antibodies in the antisera react with corresponding antigens present on the surface of red blood cells. By observing the reactions, such as agglutination, a laboratory technician can identify the blood type accurately.

Serological testing is fundamental in blood banking, as it helps ensure safe blood transfusions by matching donors and recipients based on their blood types. This is crucial for preventing hemolytic reactions, which can occur if incompatible blood types are mixed.

Other options listed do not pertain to the identification of blood types. Electrophoresis is a technique used primarily for separating molecules based on size and charge, typically for serum proteins or nucleic acids rather than blood typing. Chromatography is a method of separating components in a mixture but is not employed for blood typing. Coagulation testing evaluates the blood's ability to clot and is unrelated to the identification of blood types through antigen-antibody interactions.