Quantitative synthetic Human parechovirus 3 RNA can be used for assay development, verification, and validation as well as monitoring of day-to-day test variation and lot-to-lot performance of molecular-based assays. The quantitative format allows for the generation of a standard curve for quantitative PCR (qPCR) to determine viral load. This preparation includes genomic segments taken from 5’UTR and the viral protein VP1.