Two-hour lactose breath hydrogen tests.
D000293:Adolescent; D001944:Breath Tests / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D006859:Hydrogen / Q000032:analysis*; D007223:Infant; D007787:Lactose Intolerance / Q000175:diagnosis*; D013997:Time Factors
D006859:Hydrogen