Genetic tests are everywhere: in medicine, in legal cases, in questions about identity, or simply to satisfy curiosity. But what can our DNA really tell us? Which tests are permitted in France? Which are not?
A clear, candid overview of what genetic tests can — and cannot — do today.
Medical genetic tests: supporting diagnosis and better treatment
This is the most closely regulated use and can be highly valuable clinically. These tests are prescribed by a doctor in a strictly medical context and accompanied by genetic counselling. They can:
- Establish a diagnosis: rare diseases, chromosomal abnormalities, hereditary cancer and more.
- Adapt treatment: in oncology or pharmacogenetics, certain tests allow medicines to be tailored to genetic profiles, helping to avoid adverse effects or choose the most effective drug.
- Monitor and anticipate: for certain late-onset conditions, such as Huntington’s disease and some cancers.
These tests are permitted in France only with a medical prescription.
Forensic and parentage tests: DNA under legal supervision
DNA is also a powerful legal tool. It can:
- Identify a suspect or exonerate a person during a criminal investigation.
- Establish a family relationship, particularly through paternity testing.
In France, a paternity test can only be carried out by order of a judge within a specific legal framework. Private arrangements or testing abroad are prohibited and punishable by law.
Predictive and preventive tests: understanding predispositions
Increasingly popular, these tests aim to identify genetic risks before a disease develops, including diabetes, cancer and neurodegenerative diseases.
They can:
- Help people adapt their lifestyle through personalised prevention.
- Guide more targeted medical monitoring when a risk has been identified.
In France, these tests must be medically justified and supervised by a healthcare professional. However, in several European countries, predisposition tests are available directly to consumers online, for example through DNA talks in Belgium. They are not authorised for direct-to-consumer sale in France.
Recreational tests: curiosity or cause for concern?
‘Where did my ancestors come from?’ Many people try to answer this question through recreational genetic tests, which are very popular in countries such as the United States, Switzerland and the United Kingdom. These promise to trace ethnic origins or uncover unexpected family connections.
Their purpose is entertainment, genealogy or personal knowledge. However, these tests are strictly prohibited in France because:
- They are not medically supervised.
- They raise ethical issues involving sensitive data, privacy and the discovery of complex family truths.
- French law prohibits genetic analysis without a strictly defined medical or judicial purpose.
In conclusion, in France, only tests prescribed by a doctor or ordered by a judge are permitted. However, as these tests become more widespread and raise numerous questions, healthcare professionals have a crucial role to play: informing, supporting and guiding.
Through ADNAcademy, professionals can access rigorous, science-based training to understand the issues surrounding genetic tests, support patients ethically and integrate genetic data into modern, personalised clinical practice.