Jones, Mark G, Cooper, Elizabeth, Amjad, Saira et al. · Clinica chimica acta; international journal of clinical chemistry · 2005 · DOI
Researchers tested blood and urine samples from ME/CFS patients and compared them to healthy people, those with depression, and those with rheumatoid arthritis. Previous studies claimed certain chemicals in urine were markers for ME/CFS, but this study could not confirm those earlier findings. However, the study did find some signs of inflammation and possible muscle changes that might explain why ME/CFS patients experience fatigue and muscle pain.
This study is important because it rigorously tests long-standing claims about specific metabolic markers in ME/CFS using better analytical methods, helping clarify which earlier findings are reproducible. The proposed inflammatory and muscular mechanisms offer a potential biological explanation for the fatigue and muscle pain that disable many ME/CFS patients. Understanding true biomarkers could eventually aid diagnosis and guide treatment development.
This study does not prove that inflammation or collagen changes directly cause ME/CFS—it only shows associations in patient samples. It does not validate previously reported metabolic markers, suggesting those earlier findings may have been false positives due to analytical method problems. The study cannot determine whether these changes are primary disease causes or secondary consequences of 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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