A systematic review and meta-analysis of urinary biomarkers in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).
Taccori, Asher, Maksoud, Rebekah, Eaton-Fitch, Natalie et al.·Journal of translational medicine·2023
Researchers looked at 21 studies examining urine samples from ME/CFS patients to find markers that could help diagnose the condition. They focused especially on a substance called cortisol (a stress hormone) in urine. While they found some differences in urine samples between people with ME/CFS and healthy people, the results were too inconsistent to identify a reliable single marker for diagnosis.