Alternative titles and symbols : Alactasia, congenital; Disaccharide intolerance II;
Description : Congenital lactase deficiency is a severe gastrointestinal disorder characterized
by watery diarrhea in infants fed with breast milk or other lactose-containing formulas.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in lactase (LCT, 603202.0001);
Laboratory abnormalities : Decreased-absent intestinal mucosa lactase activity; Normal maltase, isomaltase, and sucrase activity;