The UK biobank have shared samples with Karl Morten at Oxford University to look for metabolites & other chemical clues.
http://cureme.lshtm.ac.uk/biobank-samples-received-dr-karl-morten/
http://cureme.lshtm.ac.uk/biobank-samples-received-dr-karl-morten/
Dr Morten’s research will use mass spectrometry techniques (among others) to investigate metabolites, chemical clues that have been left behind after metabolism in the cells of people with ME.