[Association between alterations in the expanded lymphoid profileby flow cytometry and inborn errors of immunity].

Objective: To evaluate the association between the expanded lymphoid profile and inborn errors of immunity using flow cytometry.

Methods: Observational and cross-sectional, case-control study, carried out in patients with a diagnosis or clinical suspicion of inborn errors of immunity, treated at the Santísima Trinidad Children's Hospital in Córdoba, Argentina, from August 2021 to November 2022. Clinical data were collected, and peripheral blood samples were obtained for flow cytometry analysis, using the PIDOT tube, to identify lymphocyte subpopulations.