Stringent guidelines of quality assurance and control (QA/QC) serve as the foundation for dependable and reproducible results in any analytical endeavor. To ensure the highest caliber data, Rules-Based Medicine (RBM) has established a rigorous set of criteria that serve as a guide through every stage of sample processing, from the development, validation, and manufacturing of our assays; to the testing, quality controlling and reporting of the data. Here we highlight step-by-step, the measures implemented by RBM that take Luminex xMAP® technology to a new level of reproducibility and ruggedness. The RBM platform combines the sensitivity and dynamic range of microsphere-based immuno-multiplexing with the precision and dependability of automated liquid handling. Together these features set RBM apart from other biomarker testing labs by offering high quality, cost-effective immunoassay measurements. A QA/QC White Paper by Brian T. Welsh, Ph.D. and Dr. James Mapes