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Gastroenterology›Condition·Updated Jun 27, 2026·v1

Celiac Disease

Celiac disease is a systemic autoimmune condition triggered by gluten in HLA-DQ2/DQ8 positive individuals. Diagnosis relies on the triad of positive serology (tTG-IgA), histological evidence of villous atrophy (Marsh $\ge$ 2), and a gluten-containing diet. Management is centered on a strict lifelong GFD. Failure to achieve mucosal healing increases the risk of T-cell lymphoma and small bowel adenocarcinoma. Refractory cases may require corticosteroids or JAK inhibitors.

High Evidence315 references·7,932 words·32 min read·v1
Celiac DiseaseGluten-Free DietVillous AtrophyAutoimmune EnteropathyGastroenterology

Quick Reference

RxDrug of choiceStrict lifelong Gluten-Free Diet (GFD)
AltAlternativesBudesonide (RCD1), Tofacitinib (RCD2), Low FODMAP diet (for persistent non-gluten symptoms)
⊘AvoidHydrolyzed wheat products, gluten-containing grains (wheat, barley, rye)
DxTest of choicetTG-IgA + Total IgA (Screening); Duodenal Biopsy (Confirmation)
ScKey scoreMarsh Classification (Histologic grading)
→When to referDiagnosis confirmation (Gastroenterologist), Dietary planning (Registered Dietitian), Refractory symptoms (Tertiary care)
Celiac disease is an HLA-linked autoimmune enteropathy requiring a lifelong GFD; diagnosis requires positive serology and Marsh $\ge$ 2 histology while on a gluten-containing diet.
Celiac disease is a systemic autoimmune disorder triggered by the ingestion of gluten in genetically predisposed individuals carrying HLA-DQ2 or HLA-DQ8. The condition is characterized by a T-cell mediated immune response that leads to chronic inflammation of the small intestinal mucosa, resulting in villous atrophy, crypt hyperplasia, and subsequent malabsorption. While classically presenting as a pediatric malabsorptive syndrome, the modern clinical phenotype has shifted toward a systemic adult illness often manifesting as iron deficiency anemia, osteoporosis, or asymptomatic seropositivity. The only definitive treatment is a strict, lifelong gluten-free diet (GFD), which aims to achieve complete mucosal healing to prevent long-term complications, including enteropathy-associated T-cell lymphoma (EATL) and small bowel adenocarcinoma.

Overview and Recommendations

Background

  • •Celiac disease is a systemic immune-mediated enteropathy affecting approximately 1% of the global population, characterized by the triad of genetic predisposition (HLA-DQ2/DQ8), gluten exposure, and an autoimmune response leading to villous atrophy.
  • •The pathogenic cascade is driven by the enzyme (TG2), which deamidates gliadin peptides, creating high-affinity ligands for HLA-DQ2/DQ8 molecules that activate CD4+ T-helper 1 cells and trigger mucosal destruction.
  • •The clinical paradigm has shifted from a classic pediatric malabsorption syndrome to a heterogeneous systemic illness; adults now frequently present with non-classical symptoms such as iron deficiency anemia, GERD, or remain entirely asymptomatic (silent celiac disease).
  • •Histologic staging is standardized via the , ranging from Marsh 0 (normal) to Marsh 3 (total villous atrophy), with Marsh 3 being the hallmark of classic disease.
  • •Prognostic stakes are high for untreated or non-responsive patients, as persistent villous atrophy (pVA) is a primary predictor of increased mortality and the development of aggressive malignancies like enteropathy-associated T-cell lymphoma (EATL).

Evaluation

  • •Suspect celiac disease in any patient with chronic diarrhea, abdominal bloating, or unexplained iron deficiency anemia, as well as those with comorbid or other autoimmune conditions.
  • •Order (tTG-IgA) and total serum IgA as the first-line screening tests; total IgA is mandatory to rule out IgA deficiency, which can cause false-negative tTG-IgA results.
  • •Order IgG-based tests (e.g., IgG-tTG or IgG-deamidated gliadin peptide) for patients identified with selective IgA deficiency.
  • •Perform an esophagogastroduodenoscopy (EGD) for histological confirmation in all adults, regardless of serology, unless a 'no-biopsy' approach is indicated (tTG-IgA $\ge$ 10x upper limit of normal and positive EMA-IgA).
  • •Obtain multiple biopsies (at least 4-6 specimens) from both the duodenal bulb (D1) and the distal duodenum (D2-D3) to account for the patchy nature of mucosal injury and to detect 'ultra-short celiac disease'.
  • •Assess for extra-intestinal manifestations by screening for osteoporosis (DXA scan) and evaluating for , a pathognomonic pruritic blistering rash.
  • •Utilize HLA-DQ2/DQ8 genetic testing as a rule-out tool; the absence of these alleles provides a negative predictive value approaching 100%.
  • •In patients with non-responsive symptoms despite a gluten-free diet, order Video Capsule Endoscopy (VCE) to screen for distal small-bowel villous atrophy or malignancy.
  • •Escalate to Double-Balloon Enteroscopy (DBE) if VCE identifies suspicious lesions, as DBE allows for targeted biopsies of ulcerative jejunitis or EATL.

Management

  • •Initiate a strict, lifelong gluten-free diet (GFD) immediately upon diagnosis to normalize gut inflammation and resolve disease-specific antibodies.
  • •Refer patients to a specialized dietitian to implement a Gluten-Free Food Guide, emphasizing the avoidance of ultra-processed foods and the identification of hidden gluten sources.
  • •Monitor mucosal recovery via serologic markers (tTG-IgA) and, if indicated, follow-up biopsies to ensure the resolution of villous atrophy.
  • •Manage persistent gastrointestinal symptoms in patients with confirmed mucosal remission by implementing a moderately low FODMAP diet to reduce fermentable carbohydrate triggers.
  • •Administer open-capsule 3-9 mg daily for patients with Refractory Celiac Disease Type 1 (RCD1) to manage inflammation.
  • •Consider 5 mg PO BID for Refractory Celiac Disease Type 2 (RCD2), as JAK inhibition has shown efficacy in achieving clinical remission in this high-mortality phenotype.
  • •Utilize experimental TG2 inhibitors such as ZED1227 100 mg daily PO in clinical trial settings to attenuate mucosal damage during gluten exposure.
  • •Employ tight-junction regulators like larazotide acetate 0.5 to 2 mg TID PO for the relief of ongoing symptoms in adults adhering to a GFD.
  • •Avoid the use of hydrolyzed wheat products, as even low levels of residual gluten can induce mucosal injury and symptomatic relapse.
  • •Screen first-degree relatives and patients with Type 1 Diabetes proactively, as they carry a significantly elevated risk of developing the disorder.
  • •Avoid recommending cow's milk-based formula avoidance in high-risk infants, as RCTs show this does not prevent the development of celiac disease.

Board Review — High Yield

  • •HLA-DQ2/DQ8, Necessary genetic predisposition; absence virtually rules out celiac disease.
  • •tTG-IgA, First-line screening test; must be paired with total IgA to avoid false negatives in IgA-deficient patients.
  • •Marsh 3, Total or subtotal villous atrophy, the classic histologic hallmark of celiac disease.
  • •Dermatitis Herpetiformis, Pathognomonic pruritic blistering rash associated with celiac disease.
  • •Ultra-Short Celiac Disease, Variant where atrophy is limited to the duodenal bulb (D1), requiring bulbar biopsies for diagnosis.
  • •EATL, Enteropathy-associated T-cell lymphoma; aggressive malignancy strongly linked to refractory celiac disease.
  • •Refractory Celiac Disease Type 2, Characterized by aberrant IELs and clonal TCR gamma rearrangement; carries a very poor prognosis.

Deep Dive — Evidence Details

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