The Erenna® immunoassay system now benefits from a new high-definition single-molecule counting technology with which users can quantify previously undetectable biomarkers with LLoQ to femtogram levels, even in healthy populations. The system features a dynamic range of up to 4 logs, high-definition immunoassays, and a range of custom services (assay development, sample testing, and antibody derivatization). Additional assay development kits can let users develop immunoassays specific to their research needs.