A Large Study Evaluated a Rapid Toxin-Based Stool Assay for Diagnosing

question 425

Multiple Choice

A large study evaluated a rapid toxin-based stool assay for diagnosing Clostridium difficile colitis.  It evaluated the test against polymerase chain reaction, which served as the gold standard.  The following values of the new test were obtained from a hospitalized symptomatic patient population with 50% prevalence of Clostridium difficile colitis: Which of the following is the positive likelihood ratio for the new test?

• A)0)2
• B)2
• C)5
• D)6

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