The most important part of this process is registering your kit before shipping it. All five services require this, and if you don't do it, you won't be able to access your results. This requirement is to protect your privacy—your name won't appear on the kit or the results—and to easily track your kit as it goes through the process. Of course, when you sign up for an account with these services, your identity will be associated with it, but the sample and any reports stored on the service's end will just have a unique barcode.
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)?
Hello, I have done fair amount of research into my genealogy. I have found extensive info on many of the family trees yet have hit a wall with my paternal line. I have only been able to trace back to my grandfather, his father, my ggrandfather, is a mystery. I have only found a marriage certificate and some minutes from a church meeting. Would the y-dna test be the most revealing? (My brother did an Ancestry test that was interesting but not that revealing.)
Note that DNA testing isn't the only kind of kit that collects physical evidence from you these days. Ubiome is one noteworthy example. The service evaluates your microbiome—basically the bacteria that live in and on you. In our review, we took its gut biome test, which required our intrepid reviewer to send in a poop sample (insert poop emoji here).
DNA tests give you an educated estimate of your ethnic makeup and help inform genealogical research by verifying existing family trees and informing future avenues of investigation. Additionally, there's a possibility you'll find living DNA matches - distant cousins and other relations - who could share their family history with you to build a bigger picture of your family tree.
As a postscript, I eventually end up having an interesting chat with Titanovo about my “bioinformatics” (distilled from my 23andMe data). One of the first things I’m told is that my eyes are green (they’re brown). However, the bioinformatics got my skin type and frame/weight generally right and had interesting (albeit occasionally generic) things to say about exercise, diet, goals, steering clear of too much sugar and so on.

We evaluated each kit by ordering one, just like any customer would, and tracking how long it took to arrive at the lab and to get processed. Then we compared the breadth and depth of the results to see what rose to the top. The whole process was a lot of fun, in part because of the anticipation of getting the results. Most of the kits warn that testing your DNA can lead to surprising—even life-changing—results. For example, there's the story of a woman who thought she was Irish, but her DNA test revealed she was also European Jewish, Middle Eastern and Eastern European. After diligent research, she discovered that her father, who had died years earlier, had been switched at birth with another child.
Since genome sequencing is still a relatively young science, we don't recommend submitting your child’s DNA to direct-to-consumer companies. We do encourage consulting with your doctor about genetic testing for your child. Due to some concerns with the DNA testing industry, the choice to have one’s genes sequenced by a private company should be made with informed consent. Those concerns are magnified when applied to children, who cannot make their own decisions regarding the unlikely potential risks or privacy concerns.
Thank you for this webpage! It is very insightful. I wish I had found it earlier. I did the DNA test through 23andMe, a doctor’s office already had me DNA checked for health (Medical DNA Labs in Tampa, Florida). I am wanting to know more about my genealogy and the report I received from 23andMe shows most concentration from the British Isles so now I will probably do ancestry and maybe Living DNA. You did a fine job in explaining everything, again thanks!
More controversially, some of these kits profess to tell you your biological (as opposed to actual age) by measuring the length of your telomeres (in basic terms, the caps at the end of each strand of DNA that protect chromosomes, like plastic tips at the end of shoelaces). Other tests, such as 23andMe, predict higher risks of developing serious conditions, such as multiple sclerosis, Alzheimer’s and Parkinson’s, including the test for BRCA1/BRCA2 (breast and ovarian cancer) that Angelina Jolie famously underwent, going on to have a preventative double mastectomy and surgery to remove her ovaries.