Low Tissue transglutaminase IgA antibody (anti-tTG): what it means
A Tissue transglutaminase IgA antibody (anti-tTG) result below the normal range is considered low. Here is what a reduced Tissue transglutaminase IgA antibody (anti-tTG) can point to, and when it is worth discussing with a doctor.
Reference range: negative <7 U/mL; a positive test with symptoms suggests coeliac disease — must always be read with total IgA
Understand your full resultWhat a low Tissue transglutaminase IgA antibody (anti-tTG) can mean
- Negative — coeliac disease is unlikely, provided the person was eating gluten and is not IgA-deficient.
- A falling level on a gluten-free diet — in known coeliac disease, shows good adherence and gut healing.
- A false negative — possible if IgA-deficient (check total IgA) or already gluten-free before testing.
When to discuss with a doctor
Anti-tTG IgA is the first-line test when coeliac disease is suspected — for example with long-standing diarrhoea, bloating, unexplained iron, folate or vitamin-D deficiency, weight loss, or a family history. Two points are essential for a valid result: keep eating gluten until the test (and any biopsy) is done, and have a total IgA checked at the same time so an IgA deficiency does not hide a true positive. A positive result normally leads to a confirming biopsy of the small intestine rather than starting a gluten-free diet straight away, because the diet must not be started before the diagnosis is secured. Mediora.AI surfaces a positive anti-tTG alongside the deficiencies coeliac disease causes (iron, folate, vitamin D) so the pattern is visible, but the diagnosis and next steps belong with your doctor.
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.