7 DNA Test Buying Mistakes to Avoid (And What to Do Instead)

DNA tests are one of those purchases where most of the cost is decided before you spit in the tube. The wrong company for your goals, the wrong price window, the wrong assumption about subscriptions, and you have spent more for less. Here are the seven mistakes we see most often, and what to do instead.

1. Paying full price

The single most common mistake. The big four consumer tests are on sale constantly. Sale prices as of early 2026 typically take AncestryDNA and MyHeritage to $39 versus MSRPs of $99 and $89, FamilyTreeDNA Family Finder to $59 from $79, and Living DNA to around $79 from $99.

The big sale windows are DNA Day in late April, Mother’s Day, Father’s Day, Prime Day, Black Friday, Cyber Monday, and the holiday and New Year promotions. Unless you have a specific deadline (a gift, a research project tied to a date), wait six to eight weeks for the next sale. The savings beat the wait. Our DNA test cost guide has the full price picture.

2. Ignoring the subscription that does most of the work

The kit price is not the long-term cost of using Ancestry effectively for genealogy. Ancestry’s records subscriptions, which sell access to census, immigration, and historical documents, run roughly $24.99 per month for US Discovery, $39.99 for World Explorer, and $49.99 for All Access as of early 2026. Six months of any of these costs more than the kit did at sale price.

The subscription is not required to view your DNA matches or your ethnicity estimate. It is required to actually trace the family tree those matches imply. If you are buying primarily to research a tree, factor that ongoing cost in. If you just want the ethnicity and the matches list, skip the subscription entirely.

3. Picking the wrong company for your specific goal

Database size, test methods, and reporting categories vary enough that the right answer changes with the question.

If your goal is to find living relatives, the database matters most. AncestryDNA’s roughly 25 to 30 million customers is the largest by far as of early 2026; 23andMe is around 14 million; MyHeritage is in the 5 to 8 million range; FamilyTreeDNA is roughly 2 to 3 million.

If your goal is research into a specific paternal surname line, autosomal tests do not reach far enough. You want a Y-DNA test, and FamilyTreeDNA is the only major consumer brand still selling them. See autosomal vs Y-DNA vs mtDNA.

If your goal is health-adjacent reporting alongside ancestry, that narrows the field to 23andMe (FDA-authorized for several specific reports) and a small number of others, with the caveat that consumer health reporting is limited and is not a substitute for clinical testing.

4. Skipping the privacy and consent screens

Every major test asks you to make several consent decisions during sample registration. Whether the company can use your data for research. Whether your DNA can be matched against other customers. Whether you want to be included in publicly visible projects.

These decisions are reversible, but the defaults are not always what you would pick. The two consequential ones to read carefully:

Research consent. Opting in usually allows your de-identified data to be used in studies, sometimes shared with academic or commercial partners. This is your call, but it is your call to make consciously.

Match visibility and DNA matching. Some platforms let you appear in other users’ match lists or hide. Some let you opt out of matching entirely. If you have any concerns about being discovered by unknown relatives, read these screens.

For the bigger privacy picture, especially in the post-23andMe-bankruptcy landscape, our genetic data privacy guide is the canonical reference.

5. Not downloading your raw data

Every major service offers a raw-data download. Almost no one bothers.

Doing it once costs you ten minutes and protects you from a real risk: the company changing terms, going out of business, retiring a feature, or restructuring (as 23andMe has been doing through Chapter 11 and the TTAM transition). The raw data file is your DNA, in a format you can keep locally, upload to MyHeritage and FamilyTreeDNA for free matching in additional databases, or analyze with third-party tools.

Our raw DNA data guide explains what the file is and what to do with it.

6. Buying a health kit expecting clinical answers

The single most predictable disappointment in consumer genetics. A health-reporting consumer test (23andMe’s Health+Ancestry tier or tellmeGen’s bundled product, for example) reports on a defined set of specific variants. A “no variants detected” result does not rule out a condition, because the test only checks a subset of the variants that can cause it.

If you want clinical-grade genetic testing for a specific concern (family history of a hereditary cancer, planning a pregnancy with a known carrier risk, an unexplained medical condition), a consumer kit is not the right tool. A board-certified genetic counselor, searchable through the NSGC directory, can order appropriate clinical testing and interpret it in context. Many counseling appointments are covered by insurance.

7. Buying multiple kits when one with uploads would do

If you want to fish in multiple databases, you do not need to buy multiple kits. Buy one kit at the company with the largest database for your goal, download the raw data, and upload it for free to MyHeritage and FamilyTreeDNA for additional matching. AncestryDNA does not accept uploads but does provide downloads, so it is usually the starter kit; the uploads cover the rest. Living DNA also accepts free uploads for an ancestry report.

This is the standard genealogist’s workflow and it costs you one kit instead of three.

And one bonus rule

Read the buyer guides before the marketing pages. Our guide to choosing a DNA test is the overview; each test type has its own deeper guide linked from there.