What Is the Principle of Direct Antigen Testing

What is the principle of direct antigen testing?

A) A clinical specimen is mixed with an antigen, then a labeled antibody is added. If the antigen is present, a complex will form.
B) It is a process by which microbial antigens are identified in patient specimens by combining specifically with antibody molecules to form stable complexes.
C) A fluorescent antigen is added to a specimen, then an antibody to form sandwich complexes.
D) Labeled antigen is added to a specimen, and the specimen is read for fluorescence.

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