[3] Nonstandard abbreviations: GALT, galactose 1-phosphate uridyl transferase; gal-1-P, galactose 1-phosphate; DBSS, dried blood spot sample; MS, mass spectrometry; HMP, hexose monophosphate; IAR, ion abundance ratio; AP-GDM, alkaline phosphatase/galactose dehydrogenase method; AMP, aldose monophosphate; and KMP,
ketose monophosphate.