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 the two genetic markers used to screen for celiac disease: HLA-DQ2 (rs2187668) and HLA-DQ8 (rs7454108). These are the same markers tested in clinical HLA typing — which typically costs $100–300 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 — for $19, with results in minutes.

What the Test Actually Checks

Celiac disease requires HLA-DQ2 or HLA-DQ8 as a genetic prerequisite. Without at least one of these haplotypes, celiac disease is essentially ruled out — with greater than 99% negative predictive value. This is one of the strongest gene-disease associations in all of genetics.

The screening 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 extremely unlikely — less than 1% chance. This is the most clinically useful result: it effectively rules out celiac. About 60% of the population gets this answer. If you have GI symptoms, they are very unlikely to be celiac disease — your doctor can investigate other causes.

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 typically costs $100–300 and requires a blood draw. The genetic information is equivalent: both check for HLA-DQ2 and HLA-DQ8. The consumer DNA approach uses tag SNPs as proxies (~90-95% sensitivity) rather than direct HLA typing, but the negative predictive value remains greater than 99%.

If your clinical decision-making depends on HLA status, confirmatory laboratory HLA typing is recommended. For screening purposes — especially ruling out celiac — the consumer DNA approach is clinically adequate and significantly more accessible.

Other Reports from Your DNA Data

Your uploaded DNA data can also be used for:

• Nutrition & Methylation Report — MTHFR, B12, vitamin D, and nutrient metabolism ($39)
• Pain & Anesthesia Report — opioid metabolism, pain sensitivity, surgery prep ($39)
• Medication Safety Report — 48+ medications screened across 13 pharmacogenes ($49)