What role does genetic testing play in the diagnosis of gluten sensitivity?
Currently, tests are available to detect the genes that control the immune system’s reaction to gluten. These genes are called human leukocyte antigens or HLA. There are several types of HLA genes within each person. It is a particular type called HLA-DQ that is most useful in the assessment of the probability that a person may be gluten sensitive. The reason gene testing assesses probability rather than disease itself is because some people have the genes for gluten sensitivity but have no detectable evidence of the immune reaction to gluten or have no symptoms. In such people, gluten sensitivity is still possible but the probability (or in other words the chances or the odds) is lower than in a person who may be having symptoms attributable to gluten or that has antibodies detected. HLA testing is most useful when there is diagnostic confusion about whether or not a person is gluten sensitive.
