Niblett, Suzanne H, King, Katrina E, Dunstan, R Hugh et al. · Experimental biology and medicine (Maywood, N.J.) · 2007 · DOI
Researchers compared blood and urine samples from 100 people with ME/CFS and 82 healthy controls to look for abnormalities. While standard blood tests appeared normal, closer examination found subtle differences in blood cell counts and patterns in how patients' bodies were processing and excreting amino acids (building blocks of protein) and other compounds in their urine.
This study provides objective laboratory evidence of physiological differences in ME/CFS patients, potentially supporting the biological basis of the condition beyond subjective symptoms. Identifying specific metabolic anomalies could eventually help develop diagnostic markers and guide targeted treatment approaches.
This study does not prove that the observed abnormalities cause ME/CFS or explain the fatigue mechanism—they may be consequences rather than causes. The cross-sectional design cannot establish whether these changes precede illness onset or persist long-term. The findings require replication and functional validation to determine clinical significance.
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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