Based on biochemical phenotypes, genotypes, and potential development of acute and long-term complications, classical galactosemia (type I galactosemia), characterized by GALT enzyme deficiencies, can be classified into three primary forms: (1) Classical galactosemia; (2) Clinical variant galactosemia, and (3) Biochemical variant galactosemia [16]. This evidence concerns the gene GALT and galactosemia.