The branch of immunology that deals with the in vitro testing of serum is referred to as .

The branch of immunology that deals with in vitro testing of serum is referred to as serology. Serology involves the study of blood serum and other bodily fluids to detect the presence of antibodies, antigens, and other immune components. It plays a crucial role in diagnostics, enabling healthcare professionals to diagnose infections, autoimmune disorders, and blood typing, among other applications.

Serological tests can be performed for various purposes, including identifying antibodies generated in response to infectious agents, determining vaccination status, and monitoring immune responses. Techniques commonly used in serology include enzyme-linked immunosorbent assay (ELISA), agglutination tests, Western blotting, and complement fixation tests. These methods allow for the analysis of immune reactions and provide valuable information for patient management and treatment.