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Review Question - QID 213161

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QID 213161 (Type "213161" in App Search)
A 65-year-old male presents to the office for evaluation of a painful right total knee arthroplasty. He reports having the index surgery approximately 3 years ago in a different state. He reports knee pain that is worse with activity, but also present at rest. On exam, he does have a palpable effusion. You elect to aspirate the right knee which returns 50cc of cloudy synovial fluid. You send the fluid for alpha-defensin immunoassay. Which of the following is true of this study?