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Different protocols exist for newborn screening of congenital hypothyroidism (CH) worldwide, with different thyrotropin cut-off values for repetition and confirmation tests. This study aimed to assess local protocol in terms of specificity and improve our screening process by optimizing thyrotropin cut-off values. Subsequently, the cut-off values obtained were retrospectively applied to evaluate the number of tests avoided. Retrospective observational study between 2013 and 2019. All newborn children with a confirmation test for CH wer