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Old 07-27-2014
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Default A previously healthy 16-year-old girl

A previously healthy 16-year-old girl is brought to the physician because of abdominal cramps, bloating, and loose stools for 6 months. These symptoms began after she ingested skim milk in an attempt to lose weight. She is at the 50th percentile for height and 75th percentile for weight. Physical examination shows no abnormalities. Stool studies show a 3+ Clinitest reagent response and pH of 5. After the patient ingests milk, there is an increased hydrogen concentration in expired air. A deficiency of which of the following enzyme
activities is the most likely cause of the gastrointestinal symptoms in this patient?

(A) Amylase
(B) Carboxypeptidase
(C) Fructose-1,6-bisphosphate aldolase
(D) Galactokinase
(E) Lactase
(F) Sucrase
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Old 07-27-2014
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lactase deficiency
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Old 07-27-2014
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E lactase def
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