marsh classification
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The standard scoring system for celiac biopsy damage — grading the gut lining on three features from "normal" to "completely flat."
The Marsh-Oberhuber classification (commonly just "Marsh score" or "Marsh classification") is a histological grading system used to standardise the assessment of intestinal biopsy samples from celiac patients. It was developed by Michael Marsh in 1992 and updated by Oberhuber in 1999, particularly to subdivide the destructive stage 3.
The Three Features Graded
Each biopsy is scored on three histological features:
- Intraepithelial lymphocytes (IELs) — count per 100 enterocytes. Normal: <25. Elevated: >40.
- Crypt hyperplasia — whether crypts of Lieberkühn are elongated
- Villous atrophy — degree of villi flattening
The Scale
| Marsh Type | IELs Elevated | Crypt Hyperplasia | Villous Atrophy | Interpretation |
|---|---|---|---|---|
| 0 | No | No | None | Normal |
| 1 (Infiltrative) | Yes | No | None | Earliest sign; may be celiac or other cause |
| 2 (Hyperplastic) | Yes | Yes | None | Crypts responding; villi still intact |
| 3a (Destructive) | Yes | Yes | Mild | Beginning of architectural damage |
| 3b (Destructive) | Yes | Yes | Moderate | Significant absorption impairment |
| 3c (Destructive) | Yes | Yes | Complete | Flat mucosa; maximum malabsorption |
Important Caveats
The Marsh features are not specific to celiac disease — they can be caused by other conditions including:
- ncgs (elevated IELs without atrophy)
- H. pylori infection
- NSAIDs, olmesartan, methotrexate (drug-induced)
- Crohn's disease, lymphoma, tropical sprue, Whipple disease
A Marsh score must always be interpreted alongside serology and clinical context to avoid misdiagnosis.
Marsh Score and Diagnosis
The ESPGHAN 2020 paediatric guideline allows biopsy to be skipped (and therefore no Marsh score assigned) when TTG IgA is ≥10× normal + EMA positive + symptoms present. For adults, biopsy remains standard.
Marsh Score and Treatment Response
GFD response is tracked partly by repeat biopsy. Mucosal healing (improvement in Marsh score) typically takes:
- Children: 6–12 months
- Adults: 1–3 years or longer
Persistent Marsh 3 despite ≥12 months strict GFD = definition of refractory celiac disease.
Related Concepts
intraepithelial-lymphocytes | villous-atrophy | crypt-hyperplasia | enterocytes | endoscopy-biopsy | ttg-iga-test | refractory-celiac
Referenced In
diagnosis | mechanism | management | terminology | glossary