Katherine A. Devitt, Teri Oldaker, Kalpesh Shah, Andrea Illingworth
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Summary of validation considerations with real-life examples using both qualitative and semiquantitative flow cytometry assays
In the clinical laboratory, flow cytometry assays are critical to providing diagnostic and prognostic information to the treating clinicians. A validation or verification provides confidence that the assay will yield reliable results that can be trusted to make critical medical decisions. The following performance specifications should be included in a validation for laboratory developed tests as needed: accuracy (or trueness), precision (reproducibility and repeatability), detection capability, selectivity, reference range, and sample and reagent stability. We define these terms and present our approach to validation of several common flow cytometry assays, including examples of a leukemia/lymphoma assay and a paroxysmal nocturnal hemoglobinuria (PNH) assay.