How accurate are DNA tests?

doopayo
I’m very curious about genealogy, I’m aware that basically the larger the sample size for a dna test is the more accurate it’ll be. But I’ve came across some people saying they aren’t accurate because many discrepancies can still arise from differences in the companies’ DNA databases. Almost every DTC genetic test does not sequence your entire genome, but instead looks at positions in your DNA that are known to be of interest.

Once I get enough money I want to do my own little test where I purchase different dna kits from a few different companies to see how the results vary depending on which segment of my dna a certain dna test looks into 🤔 it’ll cost me a lot but it’s worth it in my opinion since it’s a topic I want to learn more about.
How accurate are DNA tests?
How accurate are DNA tests?
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