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This replication and extension of the South African findings in a small El Salvador sample shows promise and justifies the conduct of a large-scale RCT in a Central or South American context.The current diagnostic work-up of inborn errors of metabolism (IEM) is rapidly moving toward integrative analytical approaches. We aimed to develop an innovative, targeted urine metabolomics (TUM) screening procedure to accelerate the diagnosis of patients with IEM. Urinary samples, spiked with three stable isotope-labeled internal standards, were