<prompt> Urinary D-Xylose test is used for the the study of:Proximal small bowel mucosal functionDistal small bowel mucosal functionProximal small bowel serosal functionDistal small bowel serosal function  <response>: The urinary D-xylose test: Used for carbohydrate absorption Assesses proximal small-intestinal mucosal function. Ref: Harrison, E-18, P-2467. 