Not everyone in NCDS was part of the biomedical survey at age 44, and of those 9,377 who did take part, a total of 8,404 gave consent to their DNA being used. Therefore you could have taken part but chosen not to give your permission for DNA extraction.
In the Life in Your Early 60s Survey, we will ask your permission to extract DNA from your blood sample if you agree to give one. You can check the consents you give or have given in the past by contacting us.
If you have previously given your consent to extract DNA, but now you have changed your mind, let us know and we will destroy your samples. You can check what consents you have given at any time.