Suppose There Is a Need to Differentiate a Situation of True

question 10

Multiple Choice

Suppose there is a need to differentiate a situation of true malabsorption due to damage to intestinal mucosa from maldigestion due to pancreatic insufficiency.Given that one of these two situations is suspected, the patient is given a 25-gram dose of D-xylose dissolved in 300 mL of water.A blood sample is obtained 2 hours after the D-xylose administration, and a 5-hour urine is collected.The results of the D-xylose analysis are: blood xylose = 400 mg/L; urine xylose = 7 g/5 hr.These results provide laboratory evidence of:

• A)malabsorption due to damage to the intestinal mucosa
• B)maldigestion due to pancreatic insufficiency
• C)both malabsorption and maldigestion
• D)The D-xylose test alone cannot evaluate for either malabsorption or maldigestion.

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