A workcell to perform complete sample preparation for ELISAs is now available. The workcell moves samples from source plates into assay plates, performs serial dilutions (if desired), and transfers all the required reagent solutions to the assay plate, then incubates and washes the plate. This compact system contains a high-speed reagent dispenser, a 12-channel pipettor, and a plate washer. No plate-handling is necessary during the entire ELISA prep process.