Lactose intolerance Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

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A previously healthy 19-year-old man comes to his physician complaining of recurrent bloating, abdominal pain, and flatulence for the past several months. The patient has not had any recent illnesses. He recently started training to become a competitive bodybuilder and has been on a diet consisting of mainly protein shakes and yogurts. Past medical history is noncontributory, and the patient takes only a multivitamin daily. He recently traveled to China to visit his relatives. Vital signs are within normal limits. Physical examination reveals normoactive bowel sounds with no tenderness to abdominal palpation. He is administered 50 g of lactose orally. Three hours later, there is an increase in breath hydrogen content. Stool sampling reveals a decreased pH. Which of the following is the most likely cause of this patient’s symptoms?  

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