The invention relates to the technical field of biological detection, in particular to an MxA, CRP and SAA combined detection card and a preparation method and application thereof, and the preparation method comprises the following steps: 1) preparing
silicon-coated high-performance time-resolved
fluorescent microspheres; (2) marking of an MxA
antibody; (3) marking a CRP
antibody; (4) marking an SAA
antibody; (5) preparing a conjugate pad; (6) preparing a
nitrocellulose membrane; and (7) assembling the
reagent strip. The
silicon-coated high-performance time-resolved
fluorescent microspheres with the particle size range of 190-352 nm are prepared, the dye
embedding rate is high, the sensitivity is high, the monodispersity is good, the stability is good, the hydrophilicity is high, agglomeration is not prone to occurring, and the dye
embedding rate is increased. The MxA, CRP and SAA combined detection card prepared from the
silicon-coated high-performance time-resolved
fluorescent microspheres can improve the accuracy of identifying bacterial infection and
virus infection, and is beneficial to early diagnosis and treatment of acute respiratory infectious diseases.