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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Which is the following the test of choice for assessment of mucosal function of GIT?
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The correct answer is  D-Xylose is a carbohydrate which is normally absorbed from the small intestine. Measuring D-xylose level in the serum or its excretion in urine after ingestion, is used for the evaluation of carbohydrate absorption ability of the proximal small intestinal mucosa. Ref: Pocket Guide to Diagnostic Tests By Diana Nicoll, 5th Edition