Ahmed, Sakir, Aggarwal, Amita, Lawrence, Able · Rheumatology international · 2019 · DOI
This study tested how well the 2016 fibromyalgia diagnostic criteria work in hospital specialty clinics, where patients often have multiple conditions. Researchers found that the newer criteria identified some patients that an experienced doctor using older criteria would not have diagnosed, and these patients were more likely to also have other conditions like restless leg syndrome, PTSD, or chronic fatigue syndrome. The 2016 criteria performed reasonably well, but doctors should be aware they may be catching patients with overlapping conditions rather than pure fibromyalgia.
Since ME/CFS frequently co-occurs with fibromyalgia and both are classified as central sensitization syndromes, understanding how fibromyalgia diagnostic criteria perform in complex patient populations is crucial. This study demonstrates that the 2016 criteria may capture a broader, more comorbid phenotype, which has implications for ME/CFS patient populations who often meet multiple overlapping syndrome criteria. The findings help clinicians in tertiary settings recognize when patients diagnosed with fibromyalgia may actually represent complex presentations requiring evaluation for concurrent ME/CFS and other conditions.
This study does not establish causation or explain why the ACR 2016 criteria identify patients with more comorbidities—only that an association exists. The cross-sectional design cannot determine whether anxiety and other conditions influence fibromyalgia diagnosis or vice versa. The study uses ACR 1990 criteria as reference standard, which itself is not perfect, so any disagreement with ACR 2016 may reflect limitations in both criteria rather than true diagnostic accuracy.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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