Serological screening for coeliac disease: methodological standards and quality control

Area of Science:

• Gastroenterology
• Immunology
• Clinical Diagnostics

Background:

• Coeliac disease diagnosis relies on serological markers.
• Standardized methods are needed for reliable coeliac disease screening.
• European research bodies initiated a joint venture to establish these standards.

Purpose of the Study:

• To define and validate robust methodological standards for coeliac disease serological investigation.
• To introduce reliable technical standards before recommending general coeliac disease screening.

Main Methods:

• Defined joint test protocols including enzyme-linked immunosorbent assay (ELISA) for IgG/IgA gliadin antibodies and immunofluorescence for IgA endomysium antibodies.
• Prospectively tested these protocols in a single laboratory setting.
• Evaluated 88 patients: 47 with coeliac disease on a normal diet, 22 with coeliac disease on a gluten-free diet, and 19 disease controls.

Main Results:

• Individual tests did not achieve acceptable diagnostic levels.
• Combining IgA gliadin antibodies and IgA endomysium antibodies demonstrated 98% sensitivity.
• The combined test panel showed 100% specificity and 98% predictive efficiency for coeliac disease.

Conclusions:

• Standardized and refereed methods are essential for reliable coeliac disease serological screening.
• The combination of IgA gliadin and IgA endomysium antibody tests provides a highly accurate diagnostic approach.
• Further ring testing is necessary to establish these methods as a reliable basis for widespread screening.