Laboratory test kit and method for using the laboratory test kit

A laboratory test kit used for diagnosing infection caused by a virus, comprising a development part for developing thereon a test sample containing the virus, a recognition portion provided in the middle of the development part, and a reagent portion disposed in contact with an edge portion of an upstream side of the development part when a developing direction in which the test sample is developed on the development part is taken as a reference, the recognition portion on which a first specific antibody and a second specific antibody both derived from a mouse are to be immobilized for specifically recognizing a first antigen-determining site and a second antigen-determining site both possessed by the virus, the reagent portion includes a first labeled antibody and a second labeled antibody both derived from a mouse, which have a function of specifically recognizing the first antigen-determining site and the second antigen-determining site both possessed by the virus and are labeled with a labeling substance, and in each of the first labeled antibody and the second labeled antibody, at least one of an antigen site which is recognized by a human anti-mouse antibody or a sugar chain binding site recognized by an antibody which recognizes a sugar chain is defected or modified.