Natelson, B H, Ellis, S P, Braonáin, P J et al. · Clinical and diagnostic laboratory immunology · 1995 · DOI
Researchers tested 11 different immune system markers in ME/CFS patients and compared them to fatigued people without ME/CFS. They found that three immune tests (protein A binding, Raji cell test, and complement proteins C3 or C4) showed different results between the groups. However, most other immune tests they looked at, including antibody levels and other complement markers, did not reliably distinguish ME/CFS patients from those with other causes of fatigue.
Identifying reliable immune biomarkers is crucial for developing objective diagnostic tests for ME/CFS, which currently relies on clinical criteria alone. This study contributes to understanding which immune abnormalities are potentially specific to ME/CFS versus other fatigue-causing conditions. Such biomarkers could eventually help clinicians diagnose the disease more confidently and support research into disease mechanisms.
This study does not prove that abnormal protein A binding, Raji cell, or complement levels cause ME/CFS—it only shows an association. It also does not establish whether these immune markers are consistently present in all ME/CFS patients or whether they appear in other conditions. The findings cannot be generalized beyond the specific population studied or confirm clinical utility of these tests in routine practice.
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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