Jason, Leonard A, Sunnquist, Madison, Brown, Abigail et al. · Fatigue : biomedicine, health & behavior · 2015 · DOI
Researchers compared different ways of diagnosing ME/CFS by testing 796 patients using a new diagnostic system called SEID (Systemic Exertion Intolerance Disease). They found that the new SEID criteria identified about 88% of patients, which is similar to an older diagnostic system but captures a larger group than some other definitions. The study suggests that different diagnostic criteria can identify different sizes and severity levels of patient populations.
Diagnostic criteria directly affect who receives a diagnosis and what treatment or research opportunities they access. This study helps clarify that choosing different diagnostic definitions can significantly change which patients are identified and recognized, which has major implications for treatment access, research enrollment, and disease understanding.
This study does not prove which diagnostic criteria is 'correct' or most clinically useful. It is a snapshot comparison using a single questionnaire and does not validate whether any criteria better predicts disease outcomes, treatment response, or underlying biological mechanisms. The study cannot establish which criteria most accurately captures the true disease biology.
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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