]> 2026-07-31T11:52:05+00:00 WBR0208 0 en Joint fluid culture '''Incorrect''' : Joint fluid culture alone is positive only in 50% of individuals with gonococcal arthritis. Culture from joint fluid, urethra and oral cavity '''Correct''' : Culture of joint fluid and other mucosal surfaces is diagnostic in 80% of individuals. Blood culture '''Incorrect''' : Patients with the tenosynovitis, dermatitis, polyarthralgia form of DGI are more likely to have positive blood cultures than those presenting with purulent arthritis. RA factor Chemistry study of joint fluid culture '''Incorrect''' : Chemistry studies of the joint fluid, such as the concentrations of glucose, lactate dehydrogenase, or protein have only limited value; a reduction in glucose concentration and elevation of LDH are consistent with a bacterial infection, but are not diagnostic or particularly sensitive. Primary Care Office Mugilan Poongkunran A 27-year-old male presents to his primary care physician's office for joint pain over the past several days. The patient denies feeling similar pain in the past. He has tried over the counter ibuprofen but it has not relieved his pain. His past medical history is otherwise unremarkable. He smokes one pack per day and has about 20 drinks per week. He uses marijuana occasionally but denies any injectable drug use. He is sexually active and uses condoms. He denies recent travel outside the country and has no allergies. Physical examinations show mild hyperemia and swelling in the right knee and right ankle. Range of movement is restricted because of pain. No rash is present. Arthrocentesis reveals a turbid fluid with WBC count of 20,000/mm3. What is the best next step to confirm the diagnosis? B Musculoskeletal/Rheumatology Infectious Disease 2020-10-27T23:45:40Z 2459150.4900463 WBR0208