Consumer DNA tests have become a popular gift and an exciting research tool. They can reveal genuine connections, but they also have limits that are worth understanding before you send off a sample.
What a DNA test can do
- Confirm relationships. DNA can support or challenge a link you have built from records, such as whether two people were full siblings.
- Connect you with relatives. Testing services compare your results with other customers and suggest possible cousins, some of whom may hold photos or information you lack.
- Help with brick walls. Shared matches can point to a missing ancestor when the paper trail runs out.
What a DNA test cannot do
- Replace traditional research. DNA tells you that you are related to someone, not exactly how. Records are still needed to work out the connection.
- Give a precise ethnic history. Ethnicity estimates are informed guesses based on comparison groups. They can change as companies update their methods and should be treated as approximate.
- Find relatives who have not tested. You can only match with people who have tested with the same company or uploaded their results.
Types of test in brief
- Autosomal tests look at DNA inherited from both parents and are the most common choice for finding cousins.
- Y-DNA tests follow a direct paternal line and are only available to people who have a Y chromosome.
- Mitochondrial DNA tests follow a direct maternal line.
Think about privacy first
Your DNA is personal, and it is also shared with your relatives. Before testing, read the company's privacy policy and terms carefully. Check how your data is stored, whether it may be shared with researchers or authorities, and how to delete it if you change your mind.
Be ready for surprises
DNA results occasionally reveal unexpected information, such as an unknown sibling or a different biological parent. Consider how you might feel about such news, and how it could affect others, before you test. If a surprise does arrive, take your time before acting on it.
Tip: DNA works best alongside a well-researched tree. The more of your tree you have built from records, the easier it is to understand where your DNA matches fit.
