Celiac Disease HLA DQ Assoc.Celiac HLA DQ Association

Test ID: 

706457

CPT code:

81377, 81383

Synonyms:

HLA DQ2
HLA DQ8
HLA Typing (DQ2, DQ8)

Clinical Use:

Aids in the diagnosis of celiac disease. The HLA DQ Association test provides genotyping for detection of HLA-DQ2 (DQA1*05:01 or 05:05 and DQB1*02:01 or 02:02) and HLA-DQ8 (DQB1*03:02). Patients with DQ2, half DQ2 and/or DQ8 are predisposed to celiac disease. A negative result essentially rules out celiac disease. In addition to DQ2 and DQ8 status, the report also includes complete DQA and DQB genotypes, homozygosity for DQB1*02, and genetic risk assessment.

Test Information:

Celiac disease is an autoimmune disorder characterized by a well defined genetic predisposition and sensitivity to gluten (found in wheat, barley and rye) that causes inflammation in the small intestine, villous atrophy, and malabsorption. Celiac disease can present with gastrointestinal symptoms and/or widely variable non-gastrointestinal findings such as iron deficiency anemia, dermatitis herpetiformis, osteoporosis, chronic fatigue, short stature, neurologic symptoms, and many more. Gastrointestinal symptoms are present in fewer than 50% of cases of systematic celiac disease. Strict avoidance of gluten in the diet will rid inflammation in most cases, and celiac-associated antibodies are likely to disappear with time. Celiac disease affects approximately 1% of the US population, but only about 17% of cases are currently diagnosed. Underdiagnosis is likely due to the variable presentation of celiac disease and clinical overlap with numerous other disorders such as IBS. The prevalence of celiac disease in increased in certain autoimmune disorders such as insulin-dependent diabetes(~6%),thyroiditis (~2% to 4%) and Sjogren syndrome (~5%). It is also increased in Down syndrome (5% to 12%), Turner syndrome (~3%), Williams syndrome (3% to 10%) and selective IgA deficiency (~2% to 10%). Genetic predisposition to celiac disease requires the presence of specific variants of the human leukocyte antigen (HLA) class II genes HLA-DQA1 and HLA-DQB1 to be present. These genes encode the alpha and beta chains of the celiac-associated proteins DQ2 and DQ8. Presence of DQ2, half DQ2 and/or DQ8 is required but not sufficient for the development of celiac disease. One or more of these HLA results are present in 30% of the population but overall, only 3% of these individuals develop celiac disease. The risk for developing celiac disease increases when there is a first degree relative with celiac disease (eg. the risk approaches 40% for sibs with the same HLA genotype as a patient with celiac disease).

Specimen Type:

Whole blood or buccal swabs

Requested Volume: 

7 mL or four buccal swabs

Minimum Volume: 

3 mL or four buccal swabs

Container Type: 

Lavender-top (EDTA) tube or four buccal swabs in a sealed envelope (buccal swab kit).

Storage Instructions:

Maintain specimen at room temperature. Protect from extreme heat or cold.

Rejection Criteria

Incorrect specimen container (tube type); yellow-top (ACD) tube

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MCI Diagnostic

Providing top patient care with fast results. 

7018 South Utica Avenue

Tulsa, Oklahoma 74136

Hours of Operation

Mon - Sat: 7AM-11PM

Sun: 7AM-3PM

Government Contract

DUNS # 125722608

Cage Code: 3FPQ3