Klimas, Nancy G, Broderick, Gordon, Fletcher, Mary Ann · Brain, behavior, and immunity · 2012 · DOI
This review examines blood tests and biological markers that might help diagnose ME/CFS, since current diagnosis relies only on symptoms. The researchers found that multiple body systems—including the immune system, stress hormones, and nervous system—appear to be disrupted in ME/CFS patients. However, no single test yet reliably identifies the condition, suggesting ME/CFS may involve complex changes across several systems rather than one simple cause.
ME/CFS currently lacks objective diagnostic tests, making diagnosis difficult and delaying treatment. This review highlights the biological basis of ME/CFS—showing it involves real changes in immune, nervous, and hormone systems—which validates patients' experiences and could guide future research toward testable biomarkers that enable earlier, more accurate diagnosis.
This review does not prove which specific biomarkers actually cause ME/CFS versus which are consequences of the illness. It also does not establish a single definitive diagnostic test or demonstrate that any individual biomarker is reliably useful in clinical practice. The authors emphasize that finding multiple abnormalities does not yet explain how they interact to produce ME/CFS.
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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