Use of the Symptom Severity Scale Score and Widespread Pain Index in the 2010 American College of Rheumatology Preliminary Diagnostic Criteria for Fibromyalgia
The American College of Rheumatology (ACR) incorporates the Symptom Severity (SS) Scale Score and Widespread Pain Index (WPI) into preliminary criteria for the diagnosis of fibromyalgia.
Criteria for fibromyalgia - all of the following:
(1) symptoms have been at a similar level for at least 3 months
(2) there is no alternative diagnosis that can explain the pain
(3) one of the following:
(3a) WPI >= 7 and SS scale score >= 5
(3b) WPI 3 to 6 and SS scale score >= 9
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