lactase activity in intact biopsies correlated with conventional assay of tissue homogenates ( r = 0.85 , p less than 0.001 ) , and glucose uptake from 28 mm lactose was directly proportional to lactase activity ( r = 0.95 , p less than 0.001 ) in 21 subjects with normal lactase levels , six with hypolactasia ( primary or secondary to coeliac disease ) and two with lactose intolerance but normal lactase activity .
C0083183
lactase
C0022951
lactose