Frequently Asked Questions


Why we ask for information on ethnicity, blood type and sex-at-birth?

These biological factors have genetic markers in your DNA and will mean that we can cross-check that your questionnaire answers match your genetic data. That allows us to check that there aren’t any problems in our data analysis systems.

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The largest ever DNA study of ME/CFS

A partnership between

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UKRI MRC Human Genetics Unit logo
National Institute for health research