Newborn Screening of Inborn Errors of Metabolism by Capillary Electrophoresis−Electrospray Ionization-Mass Spectrometry: A Second-Tier Method with Improved Specificity and Sensitivity

The advent of electrospray-ionization mass spectrometry (ESI-MS) has given rise to expanded newborn screening programs for the early detection of inborn errors of metabolism (IEM). Despite the benefit of high-throughput screening for disease prognosis, conventional ESI-MS methods are limited by inadequate specificity, complicated sample handling, and low positive predictive outcome that can contribute to a high rate of false-positives. Herein, …