Which of the following diagnostic procedures depends on precipitation of an antigen-antibody complex?

Question

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Immunodiffusion is a diagnostic procedure that depends on the precipitation of an antigen-antibody complex. In this procedure, an antigen is placed in a well in a gel medium, and antibodies are introduced to the gel through a separate well. If the antigen and antibodies react, a visible line of precipitation is formed between the two wells. This technique is commonly used for identifying antibodies or antigens in patient serum samples.

Which of the Following Diagnostic Procedures Depends on Precipitation of an Antigen-Antibody