thirty-six children with suspected gastrointestinal hypersensitivity to cow 's milk protein were investigated before and after challenge with cow 's milk protein by one or more of four tests of gut function : the appearance of small bowel mucosa , mucosal disaccharidase levels , a 1-h blood-xylose test , and a 50 g-lactose breath-hydrogen test .
C0022885
tests
C0018941
blood