Laboratory Testing for Celiac Disease: Clinical and Methodological Considerations.

Area of Science:

• Gastroenterology and Immunology
• Clinical Diagnostics

Background:

• Celiac disease (CeD) affects 1%-3% of the population, with varied presentations from malabsorption to subtle symptoms like anemia or poor growth.
• Genetic predisposition is significant, with higher risk in relatives, those with autoimmune conditions, or chromosomal abnormalities.

Purpose of the Study:

• To evaluate the role and accuracy of laboratory testing, particularly TTG-IgA, in diagnosing celiac disease.
• To highlight the importance of diagnostic algorithms based on laboratory findings for improving CeD detection strategies.

Main Methods:

• Review of diagnostic approaches for CeD, including duodenal histology, serology (TTG-IgA, IgA endomysial antibodies), and human leukocyte antigen typing.
• Analysis of current diagnostic guidelines, especially for children, emphasizing biopsy avoidance with high TTG-IgA levels.

Main Results:

• Serological tests, specifically TTG-IgA, demonstrate diagnostic accuracy comparable to duodenal histology.
• High TTG-IgA levels allow for biopsy avoidance in children, while biopsy remains necessary for low positive results or IgA deficiency.

Conclusions:

• Laboratory testing, particularly TTG-IgA, is central to CeD diagnosis with accuracy rivaling histology.
• Development of diagnostic algorithms based on laboratory testing is crucial for advancing CeD diagnostic strategies.