What is the normal range for tTG IgA?
Table 1.
| ANTIGEN | ANTIBODY TYPE | SENSITIVITY, % (RANGE) |
|---|---|---|
| Tissue transglutaminase | IgA | 98 (78–100) |
| IgG | 70 (45–95) | |
| Deamidated gliadin peptide | IgA | 88 (74–100) |
| IgG | 80 (70–95) |
What is a positive tTG IgA result?
The finding of tissue transglutaminase (tTG) IgA antibodies is specific for celiac disease and possibly for dermatitis herpetiformis. For individuals with moderately to strongly positive results, a diagnosis of celiac disease is likely and the patient should undergo biopsy to confirm the diagnosis.
What is the normal range for celiac disease?
For example, at the Celiac Center at Beth Israel Deaconess Medical Center (BIDMC), the reference range is 0-19 units. A person with celiac disease who is carefully following the gluten-free diet should expect to see the TTG IgA number fall < 20 and remain there.
What is considered a high tTG level?
Presence of the tissue transglutaminase (tTG) IgA antibody is associated with glutensensitive enteropathies such as celiac disease and dermatitis herpetiformis. tTG IgA antibody concentrations greater than 40 U/mL usually correlate with results of duodenal biopsies consistent with a diagnosis of celiac disease.
Is IgA high or low in celiac?
Immunoglobulin A (IgA) deficiency is 10 to 15 times more common in patients with celiac disease (CD) than in healthy subjects. Serological tests have become the preferred methods of diagnosing CD in both symptomatic and asymptomatic patients.
What is tTG IgA antibody?
A tissue transglutaminase IgA (tTg-IgA) test is used to help doctors diagnose celiac disease. In this autoimmune disorder, the immune system mistakenly thinks that gluten — a protein in wheat, barley, rye, and oats — is a foreign invader.
Is IgA high or low in celiac disease?
What is the difference between tTG IgA and tTG IgG?
Because IgA antibodies typically predominate in celiac disease, testing for tissue transglutaminase (tTG) IgA antibodies is preferred over tTG IgG antibodies, except in the presence of IgA deficiency. This test should not be solely relied upon to establish a diagnosis of celiac disease.
What does transglutaminase IgA mean?
What is considered low IgA?
Any IgA value below 60 mg/dL is considered low by most labs, but only values below 7 mg/dL imply deficiency. Symptoms depend on the underlying cause. Chronic stress, poor sleep, exhaustion, and certain genetic disorders may all lead to low IgA levels or deficiency.
