Differential diagnosis of coeliac disease
Key points in the differential diagnosis of coeliac disease: lymphocytic enteritis, non-coeliac villous atrophy, seronegativity and other causes to be ruled out.
The importance of differential diagnosis in coeliac disease
Differential diagnosis plays a crucial role when coeliac disease is suspected. As with many digestive disorders, its symptoms may overlap with those of other diseases or clinical conditions.
Diarrhoea, steatorrhoea, malabsorption or digestive discomfort are not symptoms exclusive to coeliac disease. Therefore, before confirming the diagnosis, it is necessary to assess other possible causes.
What is the differential diagnosis for coeliac disease and why is it crucial?
Differential diagnosis involves investigating other diseases that may explain a clinical presentation similar to that of coeliac disease. This is very important, because neither the gastrointestinal symptoms nor certain histological findings are unique to this disease. An incorrect diagnosis may delay appropriate treatment or lead to an unnecessary gluten-free diet being prescribed.
The most common diagnostic scenario: compatible serology and biopsy
In a typical diagnostic scenario for coeliac disease, the patient presents with:
- Compatible symptoms.
- Elevated IgA anti-transglutaminase antibodies.
- Sufficient levels of total IgA.
- A duodenal biopsy showing compatible morphological changes.
In such cases, the interpretation is usually straightforward. However, not all patients fit this pattern. Diagnosis can be complicated when serology is negative, when the histological lesion is mild, or when there are other causes capable of producing similar symptoms and intestinal abnormalities.
When does the diagnosis become complicated?
The differential diagnosis becomes particularly important when the clinical presentation, serology and biopsy do not all point in the same direction.
The challenge of diagnosis in the seronegative elderly population
In elderly people with negative serology, the differential diagnosis takes on particular importance.
In this group, several factors may coexist that complicate clinical interpretation: increased use of medicines, the presence of comorbidities, impaired intestinal motility, dysbiosis, immunosenescence and hypochlorhydria.
Furthermore, conditions that are more common in older age, such as diabetes or Parkinson’s disease, can alter the intestinal clearance of bacteria and contribute to symptoms consistent with malabsorption or bacterial overgrowth.
It should also be borne in mind that some people may have silent coeliac disease for years and only develop symptoms in later life.
Tools for borderline cases: transglutaminase deposits and flow cytometry
In complex diagnostic situations, particularly where negative serology and non-specific histological findings coexist, complementary tools may be used, such as:
- The detection of subepithelial deposits of IgA transglutaminase in the intestinal mucosa.
- The analysis of intraepithelial lymphocytes by flow cytometry.
These tests can provide useful information in difficult cases, although not all centres routinely offer them.
Key point: no histological lesion is unique to coeliac disease
The main clinical message is that no degree of histological lesion - whether Marsh 1, Marsh 2 or Marsh 3 - is pathognomonic of coeliac disease. Therefore, the diagnosis must always be based on a combination of clinical presentation, serology, histology, genetics where appropriate, and the reasoned exclusion of other causes. This approach prevents both under-diagnosis and over-diagnosis, and ensures that a gluten-free diet is prescribed only when justified.
Frequently asked questions
Practical implications for avoiding diagnostic errors
The differential diagnosis of coeliac disease requires a careful interpretation of symptoms and histological findings.
When the clinical presentation is atypical, serology is negative or the biopsy shows non-specific lesions, other conditions must be considered before confirming the diagnosis. The key is not to assess each piece of information in isolation, but to fit all the pieces together: clinical presentation, serology, biopsy, medical history, gluten exposure and possible alternative causes.
Only in this way can a misdiagnosis be avoided and the most appropriate management offered to the patient.
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Sources
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- • Fernández-Bañares F, Carrasco A, García-Puig R, Rosinach M, González C, Alsina M, et al. Intestinal intraepithelial lymphocyte cytometric pattern is more accurate than subepithelial deposits of anti-tissue transglutaminase IgA for the diagnosis of celiac disease in lymphocytic enteritis. PLoS One. 2014.
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Autora Virginia Gómez
Dietitian