C difficile testing is not recommended in asymptomatic patients, owing to the difficulty in distinguishing asymptomatic carriage from infection in this setting. In addition, repeat testing for C difficile is not recommended after successful treatment in a patient recently treated for C difficile infection.
For more on the workup of C difficile infection, read here.
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Cite this: Michael Stuart Bronze. Fast Five Quiz: Are You Able to Confront Clostridium Difficile Infections? - Medscape - Jan 04, 2016.