GALT and galactosemia: For example, among the 26 newborns referred to the clinical center for increased DBS total galactose considerable overlaps in DBS galactose-1-P-uridyltransferase (GALT) activities did not allow to discriminate between newborns with variable combinations of compound heterozygosity for classic galactosemia due to pathogenic GALT gene mutations and Duarte alleles.