{Reference Type}: Journal Article {Title}: Flow Cytometry-based Immune Phenotyping of T and B Lymphocytes in the Evaluation of Immunodeficiency and Immune Dysregulation. {Author}: Nguyen AA;Platt CD; {Journal}: Clin Lab Med {Volume}: 44 {Issue}: 3 {Year}: 2024 Sep {Factor}: 2.172 {DOI}: 10.1016/j.cll.2024.04.009 {Abstract}: There are approximately 500 congenital disorders that impair immune cell development and/or function. Patients with these disorders may present with a wide range of symptoms, including increased susceptibility to infection, autoimmunity, autoinflammation, lymphoproliferation, and/or atopy. Flow cytometry-based immune phenotyping of T and B lymphocytes plays an essential role in the evaluation of patients with these presentations. In this review, we describe the clinical utility of flow cytometry as part of a comprehensive evaluation of immune function and how this testing may be used as a diagnostic tool to identify underlying aberrant immune pathways, monitor disease activity, and assess infection risk.