Our testers took multiple DNA ancestry tests, and the services returned slightly different results for each person. This doesn’t necessarily mean that any one company is more accurate than another. Every DNA testing service uses its own algorithm and data set – different reference populations drawn from different databases. Nacho Esteban of 24Genetics told us, “Ancestry is not an exact science. The top five companies in the world would show very similar results when talking about continents; the similarity is smaller when talking about countries. In regional ancestry, some border regions are difficult to identify and sometimes there may be discrepancies. So we cannot take the information as something 100% sure. But at the end, it gives a great picture of where our ancestors were from.”
When my results appear, they show nothing bad. If anything, it’s anticlimactic: cholesterol, vitamins, liver proteins and the like are all in the normal range, with only ferritin (iron stores) slightly high, with a recommendation to go easy on any iron supplements. My problem with the baseline test is that, unlike Thriva’s other products, clients are supposed to have one every three months to keep track, but would I really want (or indeed need) to do such a test so regularly?

McCartney says that anxious people often contact her, saying they wished they hadn’t done the tests. “These companies often say that it’s worth it for the helpful advice. But I can give you really good advice right now without seeing a single test result: be active, have lots of social networks, do work you enjoy, try not to smoke or drink too much, don’t be overweight or underweight, eat lots of fresh fruit and vegetables. Nobody needs to get tests done to get that kind of basic lifestyle advice.”
On all platforms except for National Geographic, you can initiate a search for relatives, though some services let you upload your National Geographic results for further analysis. The software continually searches for DNA matches as more people share their results. This feature may be useful if you're building a family tree or looking for relatives you've never met; otherwise, it may more of a nuisance. You can opt in or out at any time, and the DNA service doesn't share your contact information. Relatives can message you through the software, though. If you already use genealogy software, you may be able to download your results and upload them into your preferred program. Otherwise, AncestryDNA and others featured here have family tree software that you can easily link.
Each of the kits work similarly: You answer a few questions about yourself, order the kit, collect your sample, register the kit (this is very important), send it back, and wait for the results. That said, they differ in the collection process and, to a smaller extent, the cost of shipping. When we tested 23andMe back in mid-2015, the company was unable to accept DNA samples collected in or sent from New York State, because of local laws (we had to cross the border to New Jersey). The company was also prohibited from shipping DNA kits to Maryland.

Pet DNA tests: Companies like Embark, Wisdom Panel and many others offer genetic health risk screenings, trait analyses and breed percentage information for dogs. These canine ancestry tests allow you to confidently state that your mutt is part Irish wolf hound and give you key information about your pet’s heritage for insights into potential health issues. For example, if you find out one of your rescue dog’s parents was likely a purebred boxer, you could speak with your vet about breed-specific needs. Basepaws DNA CatKit promises information about your cat’s breed and traits with just a hair sample, though it offers swab kits for hairless cats. The kit also tells you how closely related your kitty is to wild cats like lions, tigers and (bears, oh my!) ocelots.]
Which is all very well, but do these kits work and deliver the service they promise and what about the wider ethics and implications of home genetic testing? Is it always wise for generally under-informed, under-prepared consumers to meddle in the highly complex, nuanced arena of genetics, risking confusion, complacency or even outright panic and anxiety when confronted with ostensible “bad news” (which may not even be true)?