Resources: Commercial DNA tests

HOW TO: delete your data from commercial company databases:

The following websites provide guided instructions on how your data can be deleted from a commercial DNA company’s database:

Consumer Reports: How to Delete Your Data From 23andMe, Ancestry, and Other Sites

Know Your DNA: How to Delete Your Data from every DNA testing service


F.D.A. Warns Patients About Some Prenatal Genetic TestsThe New York Times, April 2022

A new article in the New York Times has published concerns raised by the Food and Drug Administration (F.D.A) that genetic tests performed to screen for rare genetic diseases in babies, lack scientific evidence of their accuracy.  Companies are making misleading claims about their products, prompting the F.D.A to request that doctors not use commercial tests by companies on their patients. 

Despite such commercially sold tests being taken by up to a third of US pregnant women, such tests are not regulated as they are categorised as ‘lab-developed- tests’ that are not covered by the F.D.A. Private testing companies and start-ups have proliferated in the last decade, prompting calls for more thorough oversight to ensure their accuracy and utility that can assist, instead of hinder, health decisions for families and their health carers. 

This lack of regulation can have devastating impacts on families, with some women reportedly ending pregnancies as a result of false test results. The lack of regulation is becoming an increasingly controversial issue. This latest call from the F.D.A has no power to force companies to do anything besides apply for voluntary approval for their products, though the rising awareness of their limitations may impact on the companies’ bottom lines.

The article further highlights that lack of information in company brochures, with many not mentioning the possibility of  inaccurate or uninterpretable results, for example giving a false-positive result –  a result wrongly indicating the presence of mutation linked to a disease or condition. This is despite some false-positive rates for certain tests reportedly as high as 85 %. 

While selling products as ‘reliable’, ‘highly accurate’ and offering ‘peace of mind’, the response from companies to this F.D.A warning is that tests should be followed up by diagnostic testing,  which is performed by healthcare professionals. 

However, once again, as this article shows, lack of proper regulation, commercial vested interests and genetic hype are putting the lives and the health of the public at risk.


Journal of the American Medical Association (JAMA), 2022: What Can At-home Genetic Tests Tell Me About My Health?


Consumer Federation of America, 2020: Should you buy a Genetic Testing Kit?


Boston Review (2021): DNA and Our Twenty-First-Century Ancestors. By Professor Dauna Fullwiley. Home DNA ancestry kits include no ancestors, instead comparing customers to other present-day people based on assumptions about race and ethnicity. So what are they actually selling?


Twins get ‘mystifying’ DNA ancestry test results (Marketplace) CBC Radio-Canada
Vox (2019): What DNA ancestry tests can – and can’t – tell you
Gizmodo (2018): Consider These Risks Before You Take That Test


House of Commons Science and Technology Committee (June 2021): Direct-to-consumer genomic testing: First Report of Session 2021–22

UK government Science and Technology Committee recommends stronger regulations on consumer genetic testing.

A new report by the UK House of Commons Science and Technology Committee recommends that commercial testing companies selling direct-to-consumer tests should be properly regulated before they are put on the market, in order to ensure that they are reliable and clinically useful. New EU laws were recently introduced to require pre-market assessments of commercial tests (‘in vitro diagnostic medical device’ regulation (IVDR)), but are not yet fully implemented. 

However, with UK exiting the EU before these new laws were implemented as a result of Brexit, England may continue with existing legislation that allows companies to self-declare if their tests are at all accurate or reliable in giving health-related information.
(Though Scotland has implied that they will continue to follow EU rules going forward, and it is likely that Northern Ireland will have to follow such laws).

Some of the issues raised in the report include the limited number of instances where genetic tests can accurately diagnose or predict disease risk. The report warns that consumers may overestimate their risk as a result of a genetic test, which may lead to unnecessary treatments or avoiding particular activities. Meanwhile others may underestimate risk due to favourable result, and thus delay seeking medical assistance. Moreover, such results may impact on people’s mental health if a disease is untreatable.  Individual accounts of harms are described, with one example of a woman considering potentially dangerous medication following results of a commercial test.

Evidence of inaccurate or misleading results are described, noting that different results were obtained when identical samples were sent to different companies, with one report citing 40% of tests as being incorrect, and another showing that up to 80% of samples tested resulted in false-positive, incorrect results. Such inaccuracies may add unnecessary burdens to the NHS who have to confirm the commercial result, only to find that a substantial number of results are incorrect. There is a lack of study currently to be able to properly estimate the burdens and costs that such tests may place on the health service, and the report recommends that information is gathered to further understanding of this issue, as well as considering the possibility that companies can contribute to any additional costs incurred by the NHS as a result of commercial testing. There is also inconsistency between companies with regard to what gene variants are tested for. Some companies will for example test for hundreds of genes for cancer, but only 15% of genes were present across all eight companies’ testing methods, when analysed in a study. In other cases, not all genes associated with disease risk are included in tests, giving rise to the risk of false assurances.

Concerns for tests for diet and lifestyle are also raised, with one scientist’s submission describing such tests as merely ‘sexing up’ standard dietary and exercise advice to make money from people when there is no evidence that the product works. 

Privacy and consent issues are also covered, with concerns surrounding potential lack of consent when companies make broad permission requirements for ‘research and development’, or that data may be used for criminal investigations, immigration enforcement, or insurance or job applications. Further, data may be vulnerable to security risks, or transferred to other parties if ownership changes when a company is sold. Privacy issues include the ability to identify distant relatives from any individual’s data.

In light of the above concerns, the report recommends that consumer tests are independently validated in line with many of the new requirements in the new EU law, with clear standards on technical performance. Currently, there are no requirements for commercial tests to meet the standards required in other settings such as the NHS. As such, commercial test results should not be integrated into NHS patient records. 

The report also recommends, in line with the new EU legislation, that clinical ‘utility’ is independently tested prior to any test being sold to the public. The report also recommends that claims made to customers are accurate and not misleading. Performance requirements do not currently include the clinical performance of a test, which means that any test result does not necessarily lead to providing any useful information on diagnosis, treatment, management or prevention of a disease. As such, results might merely serve to give information on a genetic variant, which in itself may not translate to a beneficial clinical outcome. Experiences to date suggest that how important a genetic variant is considered to influence health and disease can change over time, and can even be disproven very quickly in the light of new understanding. 

For a test to have good clinical utility also requires that any result is placed in the wider context of an individual’s circumstances e.g. family history and symptoms, which is needed to improve the interpretation of the genetic result. The NHS already takes into consideration such contextual factors, with expert supervision along with genetic counsellors provided to assist the whole testing process. Such contextual analysis is thus recommended to be incorporated as a safeguard against inaccurate commercial testing outcomes. 

Other recommendations include that specific requirements be considered with regard to pre-natal testing, which may influence decisions on terminating pregnancies. Restrictions on such tests should be considered, along with restrictions on tests being performed on children that do not have any symptoms of ill health. 


Phillips A (2018): Direct to Consumer Genetic Tests: analysis of contracts and list of commercial companies


BMJ (2019): Direct-to-consumer genetic testing.


Why using DNA to trace ancestry is problematic:

Mathieson I & Scally A (2020) What is Ancestry?


Position Statement on Direct to Consumer Genomic Testing by the UK Royal College of General Practitioners (2019)

The Royal College of General Practitioners (RCGP) and the British Society for Genetic Medicine (BSGM) recommend that health professionals should exercise caution when asked to offer, or provide, clinical expertise about the results of Direct to Consumer (DTC) genomic or genetic testing.

The analytical validity, sensitivity and clinical utility of such testing may be much lower than is popularly perceived. For certain types of DTC results, there is a very high chance of false positive or false negative results. This means that patients should be offered the NHS care which would otherwise have been offered (e.g. family history and risk assessment, healthy lifestyle advice, or referral to specialist care)1 regardless of their DTC result.