tTG-IgA Test
The primary blood test for celiac disease. Looks for antibodies against tissue transglutaminase.
What is tTG-IgA?
The primary blood test for celiac disease. Looks for antibodies against tissue transglutaminase.
tTG-IgA Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 0.000 – 4.00 U/mL |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your tTG-IgA result may mean
Strongly suggests celiac disease, especially when paired with symptoms or genetic risk. Confirmed by biopsy.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Sources
Related Inflammation & Autoimmune biomarkers
Markers commonly tested alongside tTG-IgA.
Frequently asked
No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.
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