A 25 year-old man comes to your office complaining by Dr. Laurence

Question 10 / 32: A 25 year-old man comes to your office complaining of frequent bloating, gas, and diarrhea. His diarrhea is non-bloody and he has no associated fevers nor has he lost weight. Stool specimens checked for various infectious organisms all return negative. He notes that his symptoms typically occur shortly after eating ice cream or cheese pizza. You check stool sodium and potassium concentration and calculate the fecal osmotic gap.

Which of the following results for the fecal osmotic gap would you most likely find in this patient?

75 mosm/kg H20

25 mosm/kg H20

140 mosm/kg H20

55 mosm/kg H20

100 mosm/kg H20

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Explanation:

Case of lactose intolerance. Causes osmotic diarrhea. Fecal osmotic gap wide (usually greater than 125) due to relatively lower concentration of sodium and potassium in stool.

Assessment Home Page

https://www.jobilize.com/gastrointestinal-pathophysiology-mcq-assessment-by-dr-laurence-bailen

Gastrointestinal Pathophysiology Self-Assessment

Author:

Dr.Laurence BailenProfessor

Tufts University School of Medicine

USA

Access: Public

Attribution: Laurence Scott Bailen, Tamsin Knox, Paul Abourjaily, Fredric D. Gordon,Marshall Kaplan,Andrew G. Plaut. PPY 222 Gastrointestinal Pathophysiology, Spring 2007. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/47 (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA

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