DNA Guides
Raw DNA data interpretation: what your file can and cannot tell you
Understand raw DNA data interpretation, genetic variants, missing markers, and the limits of consumer DNA reports before making health decisions.
If you have already taken a consumer DNA test, you may have a file that looks like thousands of rows of letters and numbers. Raw DNA data interpretation connects some of those rows with published research and explains the findings. It can help you learn the language of genetics and prepare questions for a healthcare professional. It cannot provide a complete picture of your health.
What is in a raw DNA file?
Many consumer tests examine selected positions in DNA rather than reading every position in the genome. A common kind of variation is a single nucleotide polymorphism, or SNP: a difference at one DNA letter. An identifier such as an rsID names a marker; the genotype records the letters observed at that marker. NHGRI explains SNPs and why researchers study them.
Think of the file as a set of observations. A report adds an interpretation using a chosen collection of markers, studies, and rules. That distinction matters: the observations and the explanation are different things. A reassuring label in one report does not mean the original test examined every relevant genetic change.
The test method also matters. SNP-based consumer tests and whole-genome sequencing provide different kinds of coverage. Neither format makes every variant easy to interpret. MedlinePlus describes the different methods used in consumer genetic testing.
What an interpretation can help you understand
A useful educational report should identify the marker being discussed, explain what research links it to, and describe the limits of that link. It should let you distinguish the genotype found in your file from the conclusion drawn about it.
For example, a report might discuss a variant studied in a nutrient-related pathway. You can use that finding to ask, “What does the evidence show, and is it relevant to my situation?” That is a better starting point than treating a highlighted row as an instruction to buy something.
At Evigenics, an existing 23andMe, AncestryDNA, or compatible VCF file is used to create an educational report in plain language. The raw file is parsed in your browser; matched genotype pairs are sent to generate the report. You do not need another kit to explore a compatible file you already have. See the privacy notice for what is processed and saved.
Why an association does not settle a health question
Scientists often compare groups of people to find variants that appear more often alongside a condition or trait. Those studies can identify useful research leads, but an associated variant may be a nearby marker rather than the direct cause. NHGRI explains this distinction in its guide to genome-wide association studies.
Many common conditions involve multiple genes together with lifestyle and environmental factors. A single result does not capture that whole picture. Family history, symptoms, and other clinical information still matter. MedlinePlus explains complex, multifactorial disorders.
Consumer reports are generally intended to provide information, rather than diagnose or treat a condition. Their findings can require clinical confirmation before a medical decision. Read MedlinePlus’s guide to consumer genetic test results.
Read the missing information too
When reviewing a report, ask which relevant markers were actually available. “Not found in this file” and “tested and not present” are different statements. Also look for the study cited, the population studied, and an explanation of how the report uses that evidence. If those details are hard to find, ask the service to explain them.
A score needs its own definition. Ask whether it represents a comparison with a reference group, a count of variants, or an estimated probability. Do not assume that a percentile is the probability of developing a condition. Save the explanation alongside the result so it is available when you discuss it.
A practical way to use your report
- Choose one finding that interests you rather than trying to act on every highlighted marker.
- Write down the marker, the claim, the source, and any uncertainty the report describes.
- Prepare a question for a qualified healthcare professional: “Does this finding warrant further evaluation in my circumstances?”
- Keep the report private and share it deliberately. Avoid posting identifying screenshots or genotype tables publicly.
Do not change medication, supplements, or treatment solely because of an educational DNA report. For a concerning result, discuss the finding and whether confirmatory testing is appropriate with a qualified provider.
Next, learn how to download and prepare your raw DNA data, or review the privacy questions to ask before using an interpretation service. When you are ready, start with your existing file. For product questions, contact Evigenics.