Raw DNA comparison
23andMe vs AncestryDNA raw data: which is better for health analysis?
Both files work with DNA Layer. Neither is universally better for health analysis: each contains genotype calls at a provider-specific set of tested markers. If you already have either file, use it—DNA Layer checks the markers present and shows what that exact export can and cannot support.
Provider documentation reviewed 26 August 202623andMe and AncestryDNA, side by side
| Question | 23andMe | AncestryDNA |
|---|---|---|
| What does its own service emphasize? | Ancestry and traits, with FDA-authorized health reports available in supported products and regions. | Ancestral regions, genetic-relative matching, family-tree tools, and traits. AncestryHealth was discontinued in 2020. |
| What is in the standard raw export? | A zipped text file of genotype calls at predetermined markers, including rsIDs or internal IDs, positions, and allele calls. | Machine-readable genotype data generated from the lab sample and used for regions, matches, and traits. |
| Is it whole-genome sequencing? | No. The genotyping platform reads a selected set of locations. | No. The standard AncestryDNA service uses microarray genotyping; an old AncestryHealth NGS export is a separate legacy case. |
| Can the raw file diagnose a condition? | No. 23andMe says its raw data is informational and not for medical or diagnostic use. | No. The standard service is genealogical and informational; third-party health findings can require clinical confirmation. |
| Does the original file work with DNA Layer? | Yes. Upload the original genome ZIP or text export—no new test required. | Yes. Upload the original DNA Data export—no new test required. |
Why a bigger-looking file is not automatically better
Raw marker count is not the same as useful health coverage. A file can contain many markers that have no reliable interpretation for the question you care about, while omitting a smaller set that matters to a particular evidence panel. Provider test generations can also differ, so a brand-level number cannot describe every customer file.
DNA Layer therefore checks the actual file rather than assigning a provider-wide score. It detects supported markers, withholds unsupported conclusions, and shows coverage before the paid report. If you have both exports, check each separately; do not manually merge rows from different formats or reference conventions.
Which should you use?
- You already have one file: use it. There is no reason to buy a second ancestry test just to start an analysis.
- You have both files: compare the supported coverage shown for each original export, then continue with the stronger fit for your report.
- You need a clinical answer: choose an appropriate clinical test with a healthcare professional rather than relying on either consumer raw file.
- You are choosing a new ancestry service: compare its current ancestry, matching, privacy, price, and regional features—not only a headline marker count.
Download and analyze the correct file
For 23andMe, request Raw Data and look for the genome ZIP—not a Reports Summary or Ancestry Composition export. For AncestryDNA, open DNA Settings → Download or delete → Download DNA Data. Keep either original export private after download.
- Download 23andMe raw data step by step
- Download AncestryDNA raw data step by step
- Analyze a 23andMe file
- Analyze an AncestryDNA file
Privacy matters after the download
Both providers warn that they cannot protect a copy after it leaves their service. Before uploading anywhere, check whether the raw file is stored, how deletion works, whether data is used for research or model training, and whether it can be shared or sold. DNA Layer reads the original file locally in the browser and does not retain it.
Use the private DNA analysis checklistbefore choosing a tool, or see a representative DNA Layer reportbefore uploading anything.
TellMeGen
Depending on the product: ancestry, traits, wellness, health-vulnerability, hereditary-condition, and pharmacogenetic reports.
Frequently asked questions
Which raw DNA file is better: 23andMe or AncestryDNA?
Neither is universally better for third-party health analysis. Both contain genotype calls from selected markers, but their tested marker sets are not identical. Use the file you already own; a responsible analysis should measure the supported markers in that exact file rather than infer quality from the provider name.
Can AncestryDNA raw data show health risks?
Some tested markers can have health-related evidence, so a careful third-party analysis may surface relevant associations. The standard AncestryDNA product is ancestry-, matching-, and trait-focused, and its raw file is not a diagnosis. Consequential findings may be incomplete or false positive and can require clinical confirmation.
Are 23andMe and AncestryDNA raw files the same?
No. Both are machine-readable genotype exports, but the provider formats and tested marker sets differ. Even two files from the same provider can differ by test generation. Software should detect the format, normalize positions and strands, and report missing coverage rather than treating the files as interchangeable.
Do I need a new DNA test for DNA Layer?
No. DNA Layer accepts existing 23andMe and AncestryDNA raw-data exports, as well as supported MyHeritage and TellMeGen files. Upload the original export and the preview will show what that specific file can support before purchase.
Sources
- 23andMe: Accessing Your Raw Genetic Data
- 23andMe: How 23andMe Reports Genotypes
- 23andMe: Reference Genome and Strand
- 23andMe: how chip version changes raw-data marker coverage
- AncestryDNA FAQ: results, testing, and DNA Data downloads
- Ancestry Terms: downloading your DNA Data
- National Human Genome Research Institute: DTC raw data and clinical confirmation