Genetic Tests: The truth people miss.
At a glance
You open your DNA report and it says “high risk” or “low risk.” Most people do the same mistake: they treat it like a diagnosis.
But here’s the truth: a genetic test can be accurate… and still mislead you.
Here, we break down:
- What consumer genetic tests can do
- What they can’t do
- The biggest mistake people make with “risk”
- Genotyping vs full sequencing
- Why you should care that DNA is permanent data.
- The important questions to ask before you upload DNA anywhere
- What to do with your results
Genes matter
They influence how your body builds proteins, processes signals, and responds to stressors, so they can shape your risk for certain traits and diseases.
But genes are not a crystal ball.
Most common health outcomes are shaped by a mix of:
- genetics
- lifestyle (sleep, diet, activity, stress)
- environment (exposures, access to care, community factors)
- family history and chance
So if you take one thing from this:
Genetics is not destiny.
It’s one ingredient.
What genetic tests can do
Consumer DNA tests can be useful, if you know what they’re designed to report.
They can:
- Tell you about ancestry and relatives (this is what they were originally built for).
- Flag certain well-known variants, but only the ones they actually test for, and health-related findings may need clinical confirmation.
- Estimate risk for complex traits influenced by many small genetic differences (often presented as a “risk score”).
Bottom line: These tests can provide clues, not final answers.
What genetic tests can't do
This is where the confusion happens.
Consumer genetic tests usually can’t:
- Diagnose disease. Most illnesses aren’t “one gene = one outcome.”
- See everything. Many consumer tests use genotyping, not full sequencing, meaning they sample specific markers instead of reading your entire DNA.
- Replace a clinician or your context. A result’s meaning depends on your symptoms, family history, ancestry background, test coverage, and lifestyle.
Memorable rule: Risk ≠ diagnosis.
Genotyping vs sequencing (The easiest way to understand)
Think of your DNA like a book.
- Genotyping is like browsing the book, checking a set of highlighted lines and “bookmarked” pages.
- Full sequencing is like reading the whole book, chapter by chapter, line by line.
Many consumer tests use genotyping. Genotyping can still be useful. But it’s important to remember:
If a test never looked for something, it can’t report it.
“Low risk” and “high risk” can both mislead you
A “low risk” result can create false reassurance.
Example: if your report says low risk for a condition, do you suddenly feel safe to ignore healthy habits?
A “high risk” result can do the opposite: it can drop anxiety into your life, even when:
- there’s no clear action
- the result isn’t clinically confirmed
- the effect size is small
- the test coverage is limited
So don’t just ask: “Is my result true?”
Ask:
“Is this result complete… and is it actionable?”
Why you should care: DNA is permanent data
You can change your password. You can’t change your DNA. That’s why privacy and long-term control matter.
- Reason 1: Long-term control
Taken from a case study when a major genetics company filed for Chapter 11 bankruptcy (March 2025), it pushed uncomfortable questions into the spotlight:
- What happens to customer genetic data when a company is under financial pressure?
- Who controls
genetic data over time?
2. Reason 2: Privacy
We’ve already seen how quickly a breach can expand.
In April 2023, investigators found attackers accessed 18,000+ customer accounts. But because some users opted into a DNA relatives feature, it didn’t stop there, connected sensitive info tied to nearly 7 million people was exposed.
Takeaway:
Your account might be locked down, but connected features and opt-ins can widen what gets revealed.
Before you test with any company, ask:
- Who can access my data, and what am I opting into?
- How is it secured,and can I turn on extra protection like MFA?
- How long is it stored, and can I delete it?
- Will my data be shared for research, partners, or third parties, and is that opt-in or opt-out?
What to do with your results (the smart way)
Here’s how to use genetic tests responsibly:
1)
Use consumer tests for curiosity and context, not medical decisions.
2) If you see something scary or truly actionable, confirm clinically
and talk to a genetics-trained professional.
3) Protect your data:
review sharing settings, opt out if you want, use strong passwords + MFA, and consider deleting your data if you’re uncomfortable.
FULL REFERENCES
1) NHGRI / Genome.gov — Direct-to-Consumer Genetic Testing FAQ for Healthcare Professionals (2023)
2) 23andMe Customer Care — Difference Between DNA Genotyping & Sequencing
3) Gerke S, Jacoby MB, Cohen IG. Bankruptcy, Genetic Information, and Privacy—Selling Personal Information.
New England Journal of Medicine (2025). DOI: 10.1056/NEJMp2415835 https://pubmed.ncbi.nlm.nih.gov/40029207/
4) LoTempio JE Jr, Donohue CR, Moreno JD, Santos Rutschman A, Sarnoff J, Sinha MS, Stoeger T, Contreras JL.
Impact of the 23andMe bankruptcy on preserving the public benefit of scientific data. Nature Genetics (2025).
DOI: 10.1038/s41588-025-02423-8 https://pmc.ncbi.nlm.nih.gov/articles/PMC12695062/
5) Godoy J. FTC concerned about privacy protections in 23andMe bankruptcy. Reuters (March 31, 2025).
6) House Committee on Oversight and Government Reform — Comer Announces Hearing on 23andMe Bankruptcy to Safeguard Americans’ Private Genetic Data (June 5, 2025).
7) Office of the Privacy Commissioner of Canada (OPC) — Backgrounder: Summary of joint investigation into data breach at 23andMe (June 17, 2025)
https://www.priv.gc.ca/en/opc-news/news-and-announcements/2025/bg_23andme_250617/
8) UK Information Commissioner’s Office (ICO) — Statement on 23andMe investigation (March 24, 2025)
9) U.S. SEC — 23andMe Current Report (Form 8-K) (March 2025)
https://www.sec.gov/Archives/edgar/data/1804591/000119312525060817/d933650d8k.html
10) Kroll (claims agent) — 23andMe Restructuring (Chapter 11 case portal)
https://restructuring.ra.kroll.com/23andme/
Take a deep dive by watching the video below
Downloadable Resources
why genes matter for health
get PDFDownload our PDF guide “Why Genes Matter for Health” for a handy summary of key references on polygenic risk scores, pharmacogenetics, and gene–lifestyle interactions, designed to inform health decisions and enhance patient outcomes.
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