How Accurate is 23andMe? Ancestry and Ethnicity

Diahan Southard

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23andMe is one of the most popular consumer DNA tests in the world. People wonder how accurate its ancestry and ethnicity reports are. We have answers.

Recently, we published an article describing various ways a consumer DNA test for family history can be wrong—and about how much of the time, they’re not actually wrong. You just have to learn to understand what they’re saying. You might want to read that article before you continue reading specifically about how accurate 23andMe is. Go ahead—we’ll wait. But definitely come back. Because we have more to say specifically about 23andMe.

23andMe: How accurate are the results?

When people ask how accurate 23andMe tests are, they could be thinking of many kinds of results you get, including:

  • Ethnicity reports (they call these Ancestry Reports and Ancestry Composition)
  • DNA Relatives
  • Family Tree
  • Health & Traits reports

We can’t cover all of these in one article. And as a nonmedical resource, we don’t analyze the Health & Traits part at all. But here are the highlights of the most accurate, meaningful family history information you should consider.

Read article: Can A DNA Test be Wrong?

23andMe Ethnicity: Recent Ancestor Locations

When you take a 23andMe DNA test for family history, your results include information about your ancestral locations and ethnicities. While you might be curious about your Neanderthal ancestry, maternal and paternal haplogroup (just a a fancy word for deep-ancestry) reports, the most detailed information you get on ancestral locations is in your Ancestry Composition Report. But generally, these estimates are looking at the past several hundred years or more.

However, many people care most about recent ancestry: where their relatives may have lived within the past 200 years or so. For that, you’ll want to look closely at the regions (or Recent Ancestor Locations) that are embedded within your Ancestry Composition Report.

In the summary view shown below left, the regions are the specific locations that are circled and highlighted. Click on French & German, then click on the likelihood indicator (here, “highly likely match”), and you’ll see a list of the 4 specific regions with which my DNA is recently associated:

Things to know:

  • These results come from looking for identical pieces of DNA you share with more than 400,000 people of known ancestry from around the world.
  • The likelihood indicators tell you how confidently 23andMe is assigning you to these locations, based on multiple criteria. The “highly likely” indicator I got for Germany means they are at least 80% confident of this assignment. Other indicators are: “likely (50-79%); “possible” (30-49%), and “not detected” (less than 30%).
  • These are often very specific places! It’s a great clue if you’re tracing your family tree or just trying to learn where your relatives come from. If you’ve never heard about your relatives being from this part of the world, remember that a lot of people don’t know the correct origins of ALL their biological great grandparents and beyond. An unfamiliar location may represent an ancestor you just haven’t learned enough about yet.

23andMe’s DNA Relatives

At 23andMe, you opt-in to seeing your DNA Relatives (Settings > Privacy & Sharing > DNA Relatives (click Manage Your Preferences) > Yes). When you turn this feature on, you’ll be able to see a list of people who have also tested there who share a significant enough amount of DNA with you that you are likely related.

The “predicted relationship” between you and a match is an estimate based on how much DNA you share. As shown below, clicking on one of your DNA Relatives will bring up an illustration of how you may be related. But as explained in the yellow-highlighted area, the “2nd Cousin” prediction shown here represents one of many possible genealogical relationships that include half- and removed relationships that would result in about the same amount of shared DNA as an actual second cousin.

So, how accurate are these predicted relationships with your DNA Relatives? They are estimates only. You have to do additional research to see where exactly you fall on each other’s trees.

How am I really related to my DNA relatives? Learn more!

Family Tree

The last thing we’ll cover is 23andMe’s Family Tree tool. Mine looks like this:

If you know anything about genealogy, STOP in your tracks. This family tree is different than you’re used to. 23andMe’s Family Tree tool is an automatically-generated family tree based on your 23andMe DNA connections. Pause and let that sink in. This is not a traditional family tree based on historical research or family knowledge. It takes your DNA Relatives (3rd cousins or closer who have opted into DNA Relatives) and places them into the most likely tree configuration based on your shared DNA and ages. (And you just learned that the shared DNA only generates a predicted relationship, which can be wrong.)

Learn more about 23andme’s family tree

23andMe knows it’s guessing, so it has added the capacity for you to tinker with the Family Tree. To move DNA Relatives around to the proper spots (once you figure those out). To add genealogical data if you like.

So, how accurate is 23andMe?

As you’ve seen, it depends on what part of your results you’re asking about. In summary:

  • Recent Ancestor Locations (or specific regions) on your Ancestry Composition Report are typically the most accurate and meaningful connections to ancestral places within the past 200 years or so.

  • Your list of DNA Relatives does accurately state how much DNA you share with each match. This leads to a predicted genetic relationship, which may be correct but mostly represents the ballpark of genetic distance you have from that person (“we share about the same amount of DNA as 2nd cousins”).

  • Your Family Tree is a convenient, automatic reconstruction of a possible family tree, based on your 23andMe connections. It may be right, and it may require some tweaking. Maybe a lot of tweaking.

Explore Your 23andMe Results!

Here at Your DNA Guide, we guide people through their DNA discoveries. (In case you couldn’t tell from our name.) We have a 23andMe resource page packed with more free tips and tutorials JUST for 23andMe testers! We’re guessing that’s probably what you need next.

Oh, and you may also need a little reassurance. So here it is: You can DO this DNA thing! It may seem overwhelming or complicated sometimes. But you can do it. And we can help.

Go to more 23andme tips and tutorials
<a href="https://www.yourdnaguide.com/author/guideyourdnaguide-com" target="_self">Diahan Southard</a>

Diahan Southard

As founder and CEO of Your DNA Guide, Diahan Southard has been teaching people how to find family history answers in their DNA for several years, and she's been in the genetic genealogy field since its infancy. Diahan teaches internationally, writes for popular magazines, consults with leading testing companies, is author of Your DNA Guide–The Book, and producer of Your DNA Guide–the Academy, an online learning experience.

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4 Comments

  1. Herb Swain

    The images in this article are not showing. Both Firefox and Edge say there are privacy concerns. This message is from Firefox:

    “Firefox detected an issue and did not continue to staging2.diahans.sg-host.com. The website is either misconfigured or your computer clock is set to the wrong time.

    It’s likely the website’s certificate is expired, which prevents Firefox from connecting securely. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.”

    Reply
    • Diahan Southard

      Thanks for the heads up, I am sorry you are having issues. We did recently update our website, so perhaps you just need to refresh? Everything looks ok for me.

      Reply
  2. Richard Sweeting

    I have an account with 23andme and to a certain extent I am happy with the results and feedback. I say to a certain extent, because; I was and still am looking for my Father (long story and Mother would never tell me what actually happened and now far too late as she passed on some 20 years ago). However, I did identify a very, very helpful cousin and we have shared some useful information. Also, because of the strength of 23andme in the USA, I have identified many distant relatives in the USA, which does not surprise me, due to migration during the past centauries. To search further, I need a DNA organization that is very strong in the UK, who will ship their kit to me here in Spain. Or somehow the different organizations need to share with each other on behalf of us the clients. Any help is appreciated.

    Reply
    • Diahan Southard

      If your father was born outside of the US, your search is just going to be harder and take longer. But every day more people outside of the US are testing, and the odds of finding him increase. I recommend you transfer your results from 23andMe to both MyHeritage DNA and Family Tree DNA (for instructions see http://www.yourDNAguide.com/transferring). You should also take a YDNA test at Family Tree DNA to try to establish that direct male line record (see http://www.yourDNAguide.com/ydna). AncestryDNA has the largest database, but they do not shop to Spain. But I think searching in these other two databases, and taking the YDNA test, would be all steps in the right direction.

      Reply

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