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The 16 countries that have active NBS programs screen for congenital hypothyroidism, 14 for phenylketonuria, 12 for congenital adrenal hyperplasia and cystic fibrosis, and 8 for galactosemia. NBS by tandem mass spectrometry is implemented at a national level only in two countries. Despite these disparities, sustained and significant growth has become evident in the last decade, highlighted by the implementation of new programs, the increase in coverage, the expansion of the panel diseases, the enactment of new NBS laws, and the increasing involvement of gov