7 Myths About DNA Testing: What’s True, What’s Not, and Why It Matters

DNA testing has become a popular way to explore family history, connect with relatives, and learn more about personal heritage. Yet despite its growing popularity, many people hesitate to take a DNA test because of assumptions that simply aren’t true.

Some of these myths come from misunderstandings about genetics. Others stem from outdated information or exaggerated claims. Clearing them up can help you approach DNA testing with confidence and realistic expectations.

Myth 1: DNA tests tell you exactly where your family comes from

There’s a common belief that a DNA test can pinpoint your origins to a single place with complete certainty. This expectation might come from how results are presented visually, with maps and regional labels that feel very precise. In reality, DNA reflects patterns of inheritance over many generations, not a single moment in time.

DNA testing provides estimates based on comparisons with reference populations. With MyHeritage DNA, results include an Ethnicity Estimate as well as Genetic Groups, which can sometimes connect you to a very specific region, even to the level of a town or village.

That said, these results are still based on statistical models and available data. Genetic Groups are highly informative, but they are not guaranteed to represent an exact birthplace or a single ancestor. Instead, they reflect where groups of people with similar DNA patterns have lived over time.

Example of a Genetic Group on MyHeritage DNA

Used together with family trees and historical records, these insights can be remarkably powerful — but they are best understood as clues, not absolute answers.

Myth 2: Your DNA results never change

Many people are excited to review their DNA results once they come in — but never come back to them again, on assumption that once those results come in, that’s the final version.

While your DNA itself does not change, your MyHeritage DNA results can evolve over time. As the database grows and reference populations improve, ethnicity estimates may be refined. You may also receive new DNA Matches as more people test and join the platform.

When updates happen, they don’t mean your earlier results were incorrect. They reflect improved data and a broader comparison set. For many users, these refinements actually bring their results closer in line with what they already know from family history research.

This ongoing improvement is especially valuable for people researching family history, since new matches can unlock connections that were not visible before.

Myth 3: Siblings should receive identical DNA results

It may seem logical that siblings would receive identical DNA results, but genetics rarely works that neatly.

While both siblings inherit all their DNA from the same two parents, the 50% that each sibling inherits from each parent is random. As a result, siblings tested with MyHeritage DNA may show different ethnicity percentages and match with different relatives, even though they come from the same family.

To give a simplified example, if one parent is 50% Italian and 50% Irish, and the other is 50% Swedish and 50% Portuguese, one sibling could inherit 50% Italian and 50% Swedish, while the other could inherit 50% Irish and 50% Portuguese. In reality, the DNA is rarely that neatly divided, but this example helps demonstrate how diverse two siblings’ DNA can be. Over generations, this randomness is what creates genetic diversity — and it’s why comparing siblings’ results can actually reveal more than looking at just one test alone.

Myth 4: DNA testing replaces traditional genealogy research

DNA testing is a powerful tool, but it does not replace traditional family history research.

MyHeritage DNA was developed specifically with genetic genealogy in mind, meaning it works hand in hand with family trees and historical records. DNA Matches can suggest shared ancestors, while records and trees help confirm those relationships and add historical context.

Rather than replacing genealogy research, DNA testing enhances it. Genetic insights and matches can help people break through research dead ends and uncover connections that documents alone may not reveal.

DNA testing is especially helpful when records are missing, inconsistent, or hard to access. In these cases, DNA Matches can point researchers toward the right family line, which narrows the search and makes traditional research more focused and efficient.

Myth 5: DNA tests can identify every relative

A DNA test can reveal many relatives, but it cannot identify everyone in your family.

With MyHeritage DNA, you can only be matched with people who have also tested and are part of the database. Some family branches may be better represented than others, depending on who has chosen to test with that particular company.

Additionally, while DNA testing is extremely accurate for locating and identifying close family members, the more distant a relative is, the less DNA they share with you. Because of the random nature of DNA inheritance and recombination, you may even have relatives who share a common ancestor with you, proven via impeccable genealogical research, who share no common DNA with you at all.

Myth 6: DNA testing is only for experts

Some people hesitate to take a DNA test because they worry it will be too technical or difficult to understand.

MyHeritage DNA is designed to be accessible to beginners, with clear explanations and intuitive tools. At the same time, it offers advanced features for those who want to explore their results in greater depth as their confidence grows.

You don’t need prior experience with genetics or genealogy to get started. Curiosity is enough.

Myth 7: DNA testing puts your privacy at risk

It makes complete sense to be concerned about privacy with DNA testing. DNA is deeply personal information, and many people worry about who can access it, how it might be used, and whether it could be shared without their knowledge.

These concerns are exactly why it’s important to choose a DNA testing service that is transparent about how data is handled. With MyHeritage DNA, users remain in control of their information. You decide whether you participate in DNA Matching, who can see you as a match, and how your data is used within the platform.

MyHeritage has also made a clear commitment to protecting user privacy and will never sell or license users’ DNA data to third parties without explicit consent. Privacy settings are available at any time, allowing you to review and adjust your choices as your comfort level evolves.

For many people, understanding these safeguards turns DNA testing from something that feels risky into something that feels considered and empowering. Being informed — and having control — makes all the difference.

Understanding DNA testing helps you get more out of it

DNA testing isn’t magic, but when understood correctly, it can be an incredibly meaningful way to explore family history. Knowing what DNA testing can and cannot do helps set realistic expectations and leads to better discoveries.

MyHeritage DNA combines genetic insights with family trees and historical records, making it easier to turn DNA results into real understanding. If you’re ready to begin that journey, order a DNA testing kit and take the first step toward discovering more about who you are and where you belong.

Daniella Levy is the Senior Copywriter and Content Manager at MyHeritage with years of experience creating content that helps people explore their family history. Through her work on hundreds of articles, blog posts, video scripts, and user education materials, she has developed deep familiarity with genealogical research tools, historical records, and the challenges and joys of family history discovery. Daniella draws on her background in creative writing to make genealogy more accessible, engaging, and meaningful for MyHeritage users worldwide. She is also the author of 3 books.