Your 23andMe results are organized into several distinct report categories, each telling you something different about your DNA. The main sections are Ancestry, Health Predispositions, Carrier Status, Pharmacogenetics, Wellness, and Traits. Understanding what each section actually measures, and what it doesn’t, is the key to reading your results accurately.
The Main Report Categories
When you log into your 23andMe dashboard, you’ll see your results split into tabs or sections. Here’s what each one covers:
- Ancestry Composition: A percentage breakdown of your genetic origins across world regions, displayed as both numbers and a color-coded chromosome map.
- Health Predispositions: Reports on genetic variants linked to conditions like late-onset Alzheimer’s, Parkinson’s, or celiac disease. Some of these are FDA-cleared; others are based on 23andMe’s own research.
- Carrier Status: Whether you carry variants for inherited conditions like cystic fibrosis or sickle cell anemia that you could pass to children.
- Pharmacogenetics: How your body may process certain medications, based on variants in genes involved in drug metabolism.
- Wellness: Reports on genetically influenced traits related to lifestyle, like caffeine metabolism, sleep quality, or lactose tolerance.
- Traits: Predictions about physical characteristics and preferences, from hair texture to asparagus odor detection.
Health Predispositions vs. Carrier Status
This is the distinction that confuses most people, and it matters. The two report types measure fundamentally different things.
Carrier status reports identify variants that directly cause genetic disorders. These variants produce changes in your cells that lead to disease symptoms. But being a “carrier” means you have only one copy of the variant. You typically won’t develop the condition yourself. The report matters most for family planning: if both you and a partner carry the same variant, a child could inherit two copies and develop the condition. The reports also cannot tell you anything about the health of a current pregnancy or a newborn.
Health predisposition reports work differently. They flag variants that correlate with higher rates of certain diseases in studied populations, but they don’t have the same direct cause-and-effect relationship. A result of “Variant Detected” means you carry one or more tested variants and may be at increased risk, but it does not mean you will develop the condition. A result of “Variant(s) Not Detected” means you don’t have the specific variants 23andMe tested for, but other genetic or non-genetic factors could still affect your risk. Think of these as one data point, not a diagnosis.
Reading Your Ancestry Composition
Your ancestry results show up in two forms: a percentage table and a chromosome painting. The painting is a visual map where each of your 23 chromosome pairs is colored to represent the ancestral populations your DNA segments match.
By default, your results display at the “Most Likely” confidence level. This assigns each DNA segment to whichever population it has the highest probability of matching, even if that probability is relatively low. For example, a segment with a 45% chance of being Southern Italian, 30% Northern Italian, and 20% Greek would show as Southern Italian because that’s the single best guess.
You can change this by clicking “Change confidence level” and moving the slider upward. At 80% confidence, that same segment would no longer qualify as Southern Italian (since 45% is well below the 80% threshold). Instead, it would be labeled something broader like “Broadly European” or left as “Unassigned.” Higher confidence settings give you fewer specific ancestry labels but more reliable ones. Lower settings give more detail but more guesswork. Neither is wrong; they’re just different lenses on the same data.
One useful trick: if you see the same ancestry color painted in the same spot on both copies of a chromosome, you inherited that ancestry from both parents in that region. If your parents have different genetic backgrounds, you can sometimes figure out which chromosome copy came from which parent just by looking at the color patterns.
DNA Relatives and Shared DNA
The DNA Relatives feature compares your DNA to other 23andMe customers who have opted into the tool. It estimates relationships based on how much DNA you share, expressed as a percentage. The system can confidently detect relatives who share at least one continuous matching segment of 7 centimorgans (a unit measuring genetic distance) with at least 700 matching data points.
Predicted relationships are estimates, not certainties. The same percentage of shared DNA can correspond to multiple possible relationships. Sharing around 12.5% of your DNA could mean a first cousin, a half-aunt, or a great-grandparent. 23andMe picks the most likely relationship, but context matters. If someone shows up as a predicted “first cousin” but you know your family tree well enough to rule that out, they may be a different relative type that shares a similar amount of DNA. Close relationships (parent, sibling) are predicted with high accuracy; distant ones (third cousins and beyond) get increasingly uncertain.
Pharmacogenetics Reports
These reports tell you about genetic variants that affect how your body breaks down certain medications. 23andMe tests variants across several genes involved in drug metabolism. The results indicate whether you may metabolize specific types of drugs faster or slower than average.
This is where careful reading is essential. The reports do not tell you whether a specific medication will or won’t work for you. They don’t recommend dosages, and they aren’t a reason to start, stop, or change any medication on your own. What they are useful for is bringing to a conversation with a doctor or pharmacist, who can interpret the results alongside your full medical picture. The FDA cleared these reports specifically as a tool to “inform discussions with a healthcare professional,” not as standalone medical guidance.
What 23andMe Doesn’t Test
23andMe uses a genotyping chip, not full genome sequencing. This means it checks specific known locations in your DNA rather than reading every letter of your genetic code. If a disease-causing variant exists in a location the chip doesn’t cover, your report will say “Variant Not Detected” even though the variant is there. A clean result doesn’t guarantee you’re not at risk for a condition; it means 23andMe didn’t find the specific variants it was looking for.
This is especially important for health predisposition reports. The BRCA1/BRCA2 report, for instance, tests for a handful of specific variants most common in people of Ashkenazi Jewish descent. Thousands of other BRCA variants exist that the test doesn’t cover. A negative result on 23andMe is not equivalent to a negative result from clinical genetic testing.
Downloading Your Raw Data
You can download your complete raw genotype file to use with third-party analysis tools. Navigate to you.23andme.com/tools/data/, or click your profile name in the top right corner, select Resources, then “Browse Raw Genotyping Data,” and click “Download.” The file downloads as a zipped text file with a name starting with “genome.” Some computers will automatically unzip it, in which case you’ll find it as a .txt file instead.
The raw data file contains hundreds of thousands of individual genetic markers listed by their location and your genotype at each position. It’s not designed to be human-readable on its own, but third-party tools like Promethease or Genetic Genie can analyze it to generate additional health and trait reports beyond what 23andMe provides. Keep in mind that third-party interpretations vary in quality and scientific rigor, and raw data analysis can surface information you weren’t expecting, including findings about disease risk or family relationships.