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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Gastroenterology

The Path to Diagnosis: Biopsies and Exclusion

At a Glance

Eosinophilic gastroenteritis (EGE) is diagnosed by evaluating your symptoms, finding abnormally high levels of eosinophils in multiple digestive tract biopsies, and ruling out other potential causes like infections, parasites, and Celiac disease.

Diagnosing Eosinophilic Gastroenteritis (EGE) is a meticulous process that combines your symptoms with microscopic evidence [1][2]. Because it is a “diagnosis of exclusion,” your medical team must play the role of detective—ruling out more common issues before confirming EGE [3][4].

The “Gold Standard” Criteria

For a formal diagnosis of EGE, clinical guidelines generally require three things to be true:

  1. Symptoms: You must have ongoing gastrointestinal symptoms (like pain, nausea, or diarrhea) [1][5].
  2. Biopsy Evidence: A microscopic exam of your tissue must show an abnormally high number of eosinophils [1][6].
  3. No Other Cause: Your doctor must confirm that no other underlying condition is causing the eosinophil buildup [1][7].

Why “Random” Biopsies Matter

During an endoscopy, your doctor uses a camera to look at your digestive tract. In many EGE patients, the tissue looks completely healthy to the naked eye [8][9]. Because the inflammation in EGE is often “patchy”—appearing in some spots but not others—doctors must take random biopsies (samples from normal-looking tissue) from multiple areas [10][11]. If they only sample tissue that looks irritated, they might miss the diagnosis entirely [12][13].

Understanding the Numbers (eos/HPF vs eos/mm²)

When a pathologist looks at your tissue under a microscope, they count eosinophils. Historically, they counted within a specific visible area called a high-power field (HPF). However, microscope lens sizes vary wildly, meaning one lab’s HPF might be much larger or smaller than another’s, leading to inconsistent diagnoses [14].

To fix this, modern pathology guidelines emphasize standardizing these counts to millimeters squared (mm²) [14]. While international experts are still finalizing the exact “cutoff” numbers, current consensus suggests thresholds like these when using HPF [14][10]:

GI Segment Potential Diagnostic Threshold (HPF)
Stomach (Gastritis) ≥20\ge 20 eosinophils per HPF [14][15]
Small Intestine (Enteritis) ≥33\ge 33 eosinophils per HPF [14][16]

Note: You should ask your doctor if your counts are standardized to mm² to ensure an accurate diagnosis.

The “Rule Out” List

Because high eosinophil counts can be caused by many different factors, your doctor must exclude these “secondary” causes [17][18]:

  • Infections: Parasites or H. pylori bacteria [17][19].
  • Inflammatory Diseases: Crohn’s disease (IBD) or Celiac disease (often checked via blood tests for tTG-IgA antibodies or looking for villous atrophy in biopsies) [18][20].
  • Systemic Conditions: Rare disorders where eosinophils attack multiple organs, such as Hypereosinophilic Syndrome (HES) or Eosinophilic Granulomatosis with Polyangiitis (EGPA) [3][21].
  • Medications: Some drug reactions can cause temporary eosinophil spikes in the gut [18].

Your Pathology Checklist

To ensure your diagnosis is as accurate as possible, check your records or ask your doctor the following:

  • [ ] Multiple Samples: Were biopsies taken from at least 5-8 different spots in the stomach and duodenum? [14][10]
  • [ ] Standardized Counts: Are the eosinophil counts reported and standardized (preferably per mm², or consistently per HPF)? [14]
  • [ ] Secondary Checks (Infections): Was a stain performed to check for H. pylori? [17]
  • [ ] Secondary Checks (Parasites): Were stool tests or other appropriate screenings performed to rule out parasitic infections? [18]
  • [ ] Secondary Checks (Celiac): Were tests run to rule out Celiac disease? [20]

Common questions in this guide

Why do doctors take random biopsies to diagnose EGE?
In EGE, the inflammation is often patchy, and your digestive tract may look completely normal to the naked eye during an endoscopy. Doctors must take random tissue samples from multiple areas to ensure they don't miss the microscopic buildup of eosinophils.
What is the difference between eos/HPF and eos/mm² on my pathology report?
Historically, pathologists counted eosinophils per high-power field (HPF), but because microscope lens sizes vary, this could lead to inconsistent results. Modern guidelines recommend counting per square millimeter (mm²) to provide a standardized, accurate diagnosis across different labs.
Why does my doctor need to rule out other conditions before diagnosing EGE?
High eosinophil counts in the gut can be caused by many different factors. Before confirming EGE, your doctor must rule out secondary causes such as parasitic infections, H. pylori, Celiac disease, Crohn's disease, or adverse reactions to medications.
How many biopsies are needed to check for Eosinophilic Gastroenteritis?
To ensure the most accurate diagnosis and account for patchy inflammation, guidelines generally suggest taking at least 5 to 8 biopsy samples from different spots in your stomach and duodenum.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.How many biopsies were taken from my stomach and duodenum, and were they 'random' samples from healthy-looking tissue?
  2. 2.What was the peak eosinophil count found in each segment of my GI tract, and is this count standardized to millimeters squared (mm²)?
  3. 3.Have you ruled out secondary causes like H. pylori, parasitic infections, or inflammatory bowel disease (IBD)?
  4. 4.Should I be screened for systemic conditions like Eosinophilic Granulomatosis with Polyangiitis (EGPA) or Hypereosinophilic Syndrome (HES)?
  5. 5.Does my pathology report mention other markers of inflammation, such as mast cells or IgG4+ plasma cells?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (21)
  1. 1

    International Consensus Recommendations for Eosinophilic Gastrointestinal Disease Nomenclature.

    Dellon ES, Gonsalves N, Abonia JP, et al.

    Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2022; (20(11)):2474-2484.e3 doi:10.1016/j.cgh.2022.02.017.

    PMID: 35181570
  2. 2

    Eosinophilic Gastrointestinal Disorders Pathology.

    Collins MH, Capocelli K, Yang GY

    Frontiers in medicine 2017; (4()):261 doi:10.3389/fmed.2017.00261.

    PMID: 29379785
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    Pathologist's approach to paediatric and neonatal eosinophilic gastrointestinal disorders.

    Campora M, Mastracci L, Carlin L, et al.

    Pathologica 2022; (114(1)):79-88 doi:10.32074/1591-951X-734.

    PMID: 35212318
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    A rare case of eosinophilic esophagitis and eosinophilic subserosal gastroenteritis with ascites.

    Šaban J, Milošević V

    The Turkish journal of gastroenterology : the official journal of Turkish Society of Gastroenterology 2019; (30(9)):851-853 doi:10.5152/tjg.2019.18680.

    PMID: 31530531
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    Small-bowel Capsule Endoscopic Features in Patients with Eosinophilic Gastroenteritis: Three Case Reports.

    Mizumoto N, Sasaki Y, Abe Y, et al.

    Internal medicine (Tokyo, Japan) 2021; (60(18)):2961-2965 doi:10.2169/internalmedicine.6935-20.

    PMID: 33776012
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    Review article: Emerging insights into the epidemiology, pathophysiology, diagnostic and therapeutic aspects of eosinophilic oesophagitis and other eosinophilic gastrointestinal diseases.

    Low EE, Dellon ES

    Alimentary pharmacology & therapeutics 2024; (59(3)):322-340 doi:10.1111/apt.17845.

    PMID: 38135920
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    Association Between Endoscopic and Histologic Findings in a Multicenter Retrospective Cohort of Patients with Non-esophageal Eosinophilic Gastrointestinal Disorders.

    Pesek RD, Reed CC, Collins MH, et al.

    Digestive diseases and sciences 2020; (65(7)):2024-2035 doi:10.1007/s10620-019-05961-4.

    PMID: 31773359
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    A multicenter, retrospective cohort study on the diagnosis, treatment and natural history of eosinophilic gastrointestinal disorders in the Netherlands.

    Gupta M, Haasnoot ML, Mookhoek A, Bredenoord AJ

    Scientific reports 2025; (15(1)):7338 doi:10.1038/s41598-025-91958-1.

    PMID: 40025110
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    A Prospective Study on the Prevalence, Extent of Disease and Outcome of Eosinophilic Gastroenteritis in Patients Presenting with Lower Abdominal Symptoms.

    Hui CK, Hui NK

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    PMID: 29212311
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    Determination of Biopsy Yield That Optimally Detects Eosinophilic Gastritis and/or Duodenitis in a Randomized Trial of Lirentelimab.

    Dellon ES, Gonsalves N, Rothenberg ME, et al.

    Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2022; (20(3)):535-545.e15 doi:10.1016/j.cgh.2021.05.053.

    PMID: 34089846
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    Gastroenterology Practice Patterns Contribute to Missed Diagnoses of Eosinophilic Gastritis and Duodenitis.

    Chehade M, Tan J, Gehman LT

    Gastro hep advances 2023; (2(3)):334-342 doi:10.1016/j.gastha.2022.11.010.

    PMID: 39132645
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    Peripheral eosinophilia and hypoalbuminemia are associated with a higher biopsy diagnostic yield for eosinophilic gastroenteritis.

    Brenner EJ, Greenberg SB, Chang NC, et al.

    Clinics and research in hepatology and gastroenterology 2021; (45(5)):101746 doi:10.1016/j.clinre.2021.101746.

    PMID: 34182183
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    A case report of eosinophilic gastroenteritis misdiagnosed as cholelithiasis.

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    Clinical case reports 2020; (8(12)):2843-2847 doi:10.1002/ccr3.3252.

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    Determination of Optimal Eosinophil Thresholds for Diagnosis of Eosinophilic Gastritis and Duodenitis: A Pooled Analysis of 4 Prospective Studies.

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    Clinical and translational gastroenterology 2024; (15(1)):e00656 doi:10.14309/ctg.0000000000000656.

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    Serial change in gastric motility in eosinophilic gastritis with pyloric stenosis assessment by abdominal ultrasonography.

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    Clinical journal of gastroenterology 2024; (17(5)):809-813 doi:10.1007/s12328-024-01998-9.

    PMID: 38853184
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    Clinical, histopathological features and efficacy of elimination diet and proton-pump inhibitor therapy in achieving histological remission in Asian children with eosinophilic gastritis.

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    Gastric biopsies with prominent eosinophils: Clinicopathologic features and response to therapy.

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This page explains Eosinophilic Gastroenteritis diagnostic procedures for educational purposes only. Always consult your gastroenterologist or pathologist to interpret your specific biopsy results and symptoms.

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