Can You Test for Celiac Disease from 23andMe Raw Data? (2026)

If you have already uploaded your DNA to 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA, your raw data likely contains two tag SNPs used to screen for celiac disease: HLA-DQ2 (rs2187668) and HLA-DQ8 (rs7454108). These SNPs are proxies for the HLA-DQ2 and HLA-DQ8 haplotypes checked by clinical HLA typing, which is ordered through a lab and requires a blood draw.

DecodeMyBio's Celiac & Gluten Screening extracts these markers from your existing raw data and tells you whether celiac disease is genetically possible for you — free to start ($59 one-time for lifetime access), with results in minutes.

What the Test Actually Checks

Celiac disease requires HLA-DQ2 or HLA-DQ8 as a genetic prerequisite. Over 99% of people with confirmed celiac disease carry at least one of these haplotypes — one of the strongest gene-disease associations in all of genetics, and the reason clinical HLA typing has such a high negative predictive value.

This screening does not perform clinical HLA typing, though. It checks two tag SNPs that are in strong linkage disequilibrium with the actual HLA haplotypes:

• rs2187668 — tags HLA-DQ2.5, found in ~90-95% of celiac patients
• rs7454108 — tags HLA-DQ8, found in ~5-10% of celiac patients who lack DQ2.5

What the Results Mean

If Both Negative (No Carriers)

Celiac disease is unlikely. About 60% of the population gets this answer. This screening uses tag SNPs as a proxy for the HLA-DQ2/DQ8 haplotypes, so it is not equivalent to clinical HLA typing — a negative result should not, by itself, be used to rule out celiac disease. Tag SNPs have been validated mainly in people of European descent and are less reliable in other populations. If you have GI symptoms, discuss the result with your doctor, who can decide whether clinical HLA typing or other testing is warranted.

Important: this does NOT rule out non-celiac gluten sensitivity (NCGS), which is a separate condition that does not depend on HLA genetics.

If Positive (One or Both Carriers)

You carry the genetic prerequisite for celiac disease, but this does not mean you have it. About 25–40% of the general population carries HLA-DQ2 or HLA-DQ8, and only ~3% of carriers develop celiac disease. If you have symptoms, the next step is a TTG-IgA blood test ordered by your doctor.

Do not start a gluten-free diet before getting a TTG-IgA test. Gluten must be in your diet for accurate antibody testing. Going gluten-free first can cause a false-negative result.

Who Should Consider This Screening

• Anyone with persistent GI symptoms (bloating, diarrhea, fatigue) wondering if gluten is the cause
• Family members of celiac patients — first-degree relatives have ~10% celiac risk
• People who are already gluten-free and want to know if it is genetically warranted
• Anyone who wants to rule out celiac before investigating other causes

How It Compares to Clinical HLA Typing

Clinical HLA-DQ typing ordered through a gastroenterologist requires a blood draw and directly types the HLA-DQ2 and HLA-DQ8 alleles. The consumer DNA approach instead reads two tag SNPs (rs2187668 and rs7454108) that correlate strongly with those haplotypes in people of European descent. Tag SNPs are not the same test as direct HLA typing: a study of tag-SNP genotyping in a non-European (Saudi) celiac population found that more than 32% of confirmed celiac patients were misclassified as non-carriers, illustrating that accuracy is population-dependent and not established as equivalent to clinical typing.

Because of this, a negative result from consumer DNA data is informative but should not, by itself, be used to rule out celiac disease — particularly if you have symptoms or a family history. If your clinical decision-making depends on HLA status, confirmatory laboratory HLA typing (or a TTG-IgA blood test done while you are eating gluten) is the appropriate next step.

Other Reports from Your DNA Data

Your uploaded DNA data can also be used for:

• Nutrition & Methylation — MTHFR, lactose tolerance, iron storage, vitamin D and nutrient metabolism
• Pain & Anesthesia — opioid metabolism, pain sensitivity, surgery prep
• Decode — medications screened against CPIC guidance