Final answer:
The Agglutination test is the immunoassay that results in the visible clumping of particles, used for detecting antibodies against pathogens and is observed visually.
Step-by-step explanation:
The type of immunoassay that typically results in the visible clumping of particles is the Agglutination test. This method is frequently used to identify the presence of antibodies against pathogens such as bacteria or substances on red blood cells. In these tests, the interaction between the antigen and antibody can lead to a visible clumping, or agglutination, which is easy to observe without the need for advanced equipment. Agglutination tests can be performed using various techniques, such as mixing patient serum with latex beads coated with the antigen or directly on a blood sample to detect hemagglutination caused by viruses.