According to the American College of Rheumatology's alternative criteria for the diagnosis of fibromyalgia, symptoms and pain locations must have been persistent for at least the past 3 months, the pain location score must be ≥ 17, and the Symptom Impact Questionnaire score must be ≥ 21.
For more on the criteria for the diagnosis of fibromyalgia, read here.
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Cite this: Herbert S. Diamond. Fast Five Quiz: How Much Do You Know About Fibromyalgia? - Medscape - Jul 18, 2016.