Abstract: A method of detecting the presence of a plurality of respiratory viruses using a multiplexed diagnostic assay is disclosed. The method provides a plurality of oligonucleotides that each is specific for a specific respiratory virus. A multiplex PCR is run using the oligonucleotides, which produces double-stranded products. The method also provides a plurality of extension oligonucleotides that each is specific for a specific double-stranded product. Each extension oligonucleotide also has a distinct second portion having a unique sequence. A primer extension reaction is run using the extension oligonucleotides, which produces single-stranded products. The single-stranded products are hybridized to a solid carrier.