InstalabCeliac Disease Panel
Should you take a Celiac Disease Panel test?
This test is most useful if any of these apply to you.
2 Biomarkers Included
- IgAMeasures the total amount of immunoglobulin A your body makes. It does not detect celiac disease itself but reveals whether the antibody test can be trusted, since low levels cause false-normal results.Low total IgA means the standard antibody test may miss celiac disease, so testing must switch to versions based on immunoglobulin G (IgG).
- tTG IgAThe antibody your immune system makes against your own gut tissue when gluten triggers celiac disease. In people with normal antibody levels, it is the single most accurate blood test for the condition.A clearly elevated level, especially several times above the cutoff, strongly points to celiac disease and warrants gastroenterology follow-up.
About Celiac Disease Panel
Celiac disease is one of the most common lifelong conditions that goes unrecognized, and it can quietly damage the lining of your small intestine long before you feel much of anything. When it is missed, the fallout tends to show up elsewhere: thinning bones, stubborn anemia, and fatigue no one can explain.
This panel is the standard first step for catching it from a single blood draw. It pairs two measurements that only make sense together: one looks for the antibody your immune system makes when gluten triggers the disease, and the other confirms your body can make that antibody at all.
What This Panel Reveals
The main marker is tissue transglutaminase IgA, an antibody (a defense protein, in the immunoglobulin A or IgA family) that your immune system aims at your own gut tissue when gluten sets off the celiac reaction. In people who make normal amounts of IgA, this one test catches roughly 93 out of 100 cases and correctly clears about 98 out of 100 people who do not have the disease. That makes it the strongest stand-alone blood test for celiac disease.
The second measurement, total IgA, is not hunting for celiac disease at all. It counts the overall amount of immunoglobulin A your body produces. This matters because 2 to 3 percent of people with celiac disease make almost no IgA, roughly 10 to 15 times the rate seen in everyone else. In those people the antibody test reads falsely normal, so checking total IgA is what keeps a reassuring result honest.
How to Read Your Results Together
The value of this panel is in reading the two numbers side by side. A normal antibody result is only trustworthy once you know the total IgA is normal too. Here is how the common combinations break down.
| What Your Results Show | What It Suggests |
|---|---|
| Normal total IgA, normal antibody | Celiac disease is unlikely, as long as you were eating gluten when tested. |
| Normal total IgA, elevated antibody | A real celiac signal. A level several times above the normal cutoff makes it very likely. |
| Low or absent total IgA | The antibody result cannot be trusted. Testing switches to immunoglobulin G (IgG) based versions. |
| Very high antibody level | Tends to track with more intestinal damage, though only a biopsy confirms the extent. |
One rule sits underneath the whole table: these tests only work while you are eating gluten. The antibody fades once gluten leaves your diet, so cutting back before testing can turn a true positive into a false all-clear.
What to Do with Your Results
An elevated antibody with normal total IgA warrants a gastroenterology referral, since a duodenal biopsy is still the usual way to confirm celiac disease in adults. When the antibody is very high, often ten times above the cutoff, a confirmatory antibody test and specialist review may support a diagnosis with less reliance on biopsy. If your total IgA is low, ask specifically for immunoglobulin G based celiac tests instead of accepting a normal IgA-based result.
Because celiac disease works by blocking nutrient absorption, it is worth pairing this panel with iron stores, vitamin D, folate, and vitamin B12, plus a bone density check if you have gone undiagnosed for years. If you have type 1 diabetes, autoimmune thyroid disease, or a first-degree relative with celiac disease, screening is recommended even without symptoms. Once diagnosed and eating gluten-free, retesting the antibody at 6 and 12 months, then yearly, tracks whether your immune activity is settling down, keeping in mind that a falling number reflects gluten avoidance more than proven gut healing.
When Results Can Be Misleading
The most common trap affects the whole panel at once: a reduced-gluten or gluten-free diet lowers the antibody signal, so a normal result in someone already avoiding wheat proves little. If you want a clean read, test before changing your diet. Low positives can also appear in other autoimmune conditions, which is one reason a weakly elevated antibody is confirmed rather than acted on alone.