A number of medical conditions is associated with altered body odor. Myalgic Encephalomyelitis/Encephalopathy/Chronic Fatique Syndrome may be one of them. Hydrogen Sulfide Urine Test was developed and is available for at-home use. Most people, however, prefer to use their nose instead, pointing that I also note that Prof. Kenny de Meirleir's work on testing was not published in a Peer Reviewed Journal.
And what abut Candida overgrowth that usually is not associated with excess hydrogen sulfide?
Biomed diagnostics offers inexpensive tests for Candida species.
Their InTrayTM ColorexTM Screen also detects E.coli, Proteus mirabilis, Enterococcus sp., Klebsiella pneumnaiae, Staphylococcus aureus bacteria
and Dermatophytes fungi.
Many tests are available for urinary tract infections and various metabolites in urine.
Here is SlideShare Presentation by Kenny De Meirleir on ME/CFS, hydrogen sulfide and aberrant prion disease: