Dr Stavy · Patient information
Genetic Testing: Uses and Limits
Genetic tests look for changes in DNA, the inherited instructions in our cells. Some tests can help answer a specific medical question; others are sold directly to consumers for broader risk or wellness reports. Their value depends on what is tested, how accurate the interpretation is and whether the result can change useful care. [1]
How do clinical and consumer genetic tests differ?
A clinical genetic test starts with a medical question. It may look for a cause of an inherited condition. A consumer test may offer a broader risk or wellness report. These are different aims. Ask exactly what the test is for and what it can show. The name of a package does not tell you its quality. The method and the plan for explaining results matter too. [1]
Ask exactly what the test looks for. A panel may examine a limited set of variants, while another test uses a broader method. A negative result from one panel does not always answer every genetic question that matters to you or your family.
| Test purpose | Question to ask before testing |
|---|---|
| A suspected inherited condition | Is this the appropriate clinical test, and which specialist will interpret it? |
| A consumer disease-risk estimate | What variants are included, and how well does the estimate apply to people like me? |
| A nutrition or wellness report | Has acting on this result been shown to improve a meaningful outcome? |
| A result already obtained elsewhere | Does it need clinical confirmation before any action is taken? |
The American Heart Association's 2025 statement discusses consumer genetic tests in cardiovascular care. It is useful for understanding issues in that field. But it does not validate every consumer test or every claim made for genetics in functional medicine. [3]
What can a genetic result tell you about risk?
A result may show a DNA change linked with a condition. It may also add to a risk estimate. It will not always tell you if you will become ill, when that might happen or how severe it might be. Ask what is known about the exact finding. Its meaning depends on the condition and the wider picture, not just on the presence of a variant. [1]
Risk is also affected by factors beyond the parts of DNA included in a report. Ask how much the finding changes what was already known from your own and your family's history. A result can be real without adding much to the decision you need to make.
Be cautious about deterministic language such as a bad gene or a gene that needs correcting through a supplement. Ask what the report actually shows and what evidence connects the planned action to better health. A risk association is not the same as a proven treatment target.
Genetics and epigenetics are related but distinct subjects. Genetic testing examines DNA variation. Epigenetic tests often examine chemical marks linked with gene regulation. A report about one should not be described as though it measures or changes the other.
Why might a result need confirmation or specialist review?
Some consumer results need a clinical check before action is taken. Ask a doctor how the first test was done and whether it can support the choice now being discussed. A raw-data summary may leave out key limits. Do not change care or make a major family decision from it alone. Bring the full report so that the finding can be reviewed and, if needed, confirmed. [3]
Some findings are uncertain. A variant can be detected even when its effect on health is unclear. The NHS explains that a genetic result may leave uncertainty rather than giving a simple yes or no answer. Ask how that uncertainty will be communicated and managed. [1]
Keep the full report and any details about the laboratory, method and date. A third-party summary or screenshot may omit important limits. If you are seeking a second opinion, the original document can help the doctor decide what needs review or confirmation.
Ask what happens if the interpretation changes as knowledge develops. Is there a process for updating the report, and who would contact you? Do not assume that buying a test creates an ongoing clinical relationship or a guarantee of future reinterpretation.
What could the result mean for relatives?
A genetic result can matter to relatives as well as to you. What it means depends on the condition and the finding. Ask about this before you have the test. Would anyone else need advice if a result were found? Who would explain it? You may want help to think about children, family history or facts you did not expect to learn. Genetic counselling can help with these questions. [1]
You may want to know if relatives would need advice or testing if a useful result is found. Ask who would explain that and what support is available. Do not send relatives a consumer risk score as though it were a confirmed diagnosis for them.
Family history can also be incomplete or sensitive. Tell the doctor what you know and where there are gaps. You do not need to guess or contact relatives before you are ready. Ask how the uncertainty affects the review and if counselling would help.
Think about what you would want to learn. Some people want the broadest possible details. Others prefer a test limited to a specific question. Talk about what the test can reveal, which choices are available and what you can decline before giving consent.
Which privacy and consent questions should you ask?
Ask who will hold your sample and your results. Find out why they need them and who else may receive them. Read the actual test provider's privacy notice and consent form. Different services can have different terms. Do not assume that one company's policy applies to another. If several firms are involved, make clear which one does each job and who will answer your questions about your data.
Make clear if data may be used for research, shared with other organisations or stored outside the country in which you receive care. Ask what choices you have and what happens if you withdraw consent. A general reassurance about compliance does not answer every question about a specific provider's practices.
Also ask how long the sample and results are kept, how you can get a copy and how unexpected findings are handled. If terms are unclear, request an explanation before sending a sample. You can take time to consider the details rather than consenting at the point of sale.
This page does not set out a test provider's privacy policy or make promises about its systems. The details must come from the service you are considering. Keep a copy of the terms you agreed to, especially if several organisations are involved in ordering, analysing and interpreting the test.
When is genetic counselling or specialist input useful?
Genetic counselling can help you think through a test and its possible results. It can cover uncertainty and what a finding may mean for your family. A specialist may also help you choose the right test or decide that none is needed. NHS guidance describes these roles in relevant care pathways. Ask what support you would have before and after testing, especially if the result could affect major decisions. [1]
If you have a worrying family history or a result you do not understand, bring it to your usual doctor. A consumer report should not be the only route into care. Equally, choosing not to buy a test does not mean that relevant symptoms or family concerns should be ignored.
The Private GP and Holistic Medical Care in London page explains broader testing decisions. Ask what useful action a planned genetic test could support and if the same decision can be made from details already available. Testing should follow a question rather than create a programme around an unexplained score.
Before booking, make clear who will order the test, who will interpret it and who handles a result needing specialist advice. These may be different people. A clear pathway matters as much as the test itself when the details could affect medical or family decisions.
Your priorities belong in the conversation
Bring the question that matters to you, the care you already receive and any practical limits a new plan needs to respect.
Read patient reviews on Google. Reviews describe individual experiences; they do not establish treatment effectiveness or predict your outcome.
Common questions
Does a genetic risk result mean I will get the disease?
A risk result does not always mean you will get the disease. Its meaning depends on the exact finding and your health history. Ask what it adds to what you already know. Does it change care, or only add an uncertain estimate? A percentage in a report is not a personal forecast of what will happen. [1]
Is a consumer DNA report a medical diagnosis?
Do not treat every consumer report as a diagnosis. Ask how the test was done, what it covers and whether a result needs a clinical check. Bring the full report to a doctor. A raw-data summary alone should not lead you to change treatment or make a major decision for your family. [3]
What is an uncertain genetic finding?
Some DNA changes have a meaning that is not yet clear. Finding the change does not prove that it causes disease. Ask who will explain it and what, if anything, you should do. Also ask whether the service reviews old results as knowledge grows, rather than assuming that buying a test includes future care. [1]
Can the result affect my relatives?
Some results can have implications for relatives, depending on the condition and inheritance pattern. Talk about this before testing and ask if genetic counselling would be helpful. A result about you should not be presented as a confirmed diagnosis for someone else without the suitable clinical review and advice. [1]
What should I ask about my genetic data?
Ask who holds the sample and data, how long they are kept, who may receive them and if research or other uses are optional. Read the actual provider's privacy notice and consent form. Do not infer those arrangements from a general statement about legal compliance or from another company's policy.
Do I have to take a genetic test to receive advice?
Not every health question needs genetic testing. Ask what a test would change and if existing history or results are enough for the decision. You can talk about your concerns and decline or defer a commercial test while its value, possible findings or data terms remain unclear.
Choose your next step
Contact the practice to clarify the appropriate appointment and its cost.
Sources and further reading
- NHS: Genetic and genomic testing. Accessed 2 October 2026.
- NHS: When to call 999. Accessed 2 October 2026.
- Direct-to-Consumer Genetic Testing for Cardiovascular Disease: A Scientific Statement From the American Heart Association. Leland E. Hull et al. (2025). Circulation. DOI: 10.1161/cir.0000000000001304. Accessed 2 October 2026.