--- title: tTG-IgA Test type: biomarker url: "https://www.test-well.com/biomarkers/ttg-iga" also_known_as: - ttg-iga - ttg iga - tissue transglutaminase iga category: Inflammation & Autoimmune units: - U/mL order_price_usd: 124.99 order_item: Celiac Disease Panel order_url: "https://www.test-well.com/tests/celiac-disease-comprehensive" reviewed_at: 2026-09-05 --- # tTG-IgA > tTG-IgA is measured with a standard blood draw; no fasting is needed. A typical reference range is 0.000 – 4.00 U/mL. At TestWell it's $124.99 all-in as Celiac Disease Panel, results in 3–7 business days, drawn at Quest. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: ttg-iga, ttg iga, tissue transglutaminase iga. ## Key facts | Fact | Value | | --- | --- | | Units | U/mL | | Sample | Blood draw | | Fasting | Not required | | Results | 3–7 business days | | Price | $124.99 | | Labs | Quest · BioReference in NY/NJ | ## What does tTG-IgA measure? The primary blood test for celiac disease. Looks for antibodies against tissue transglutaminase. ## What is the normal range for tTG-IgA? | Population | Reference range | | --- | --- | | age 18+ | 0.000 – 4.00 U/mL | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## What does a high tTG-IgA mean? Strongly suggests celiac disease, especially when paired with symptoms or genetic risk. Confirmed by biopsy. ## How do you get tested for tTG-IgA? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Celiac Disease Panel](https://www.test-well.com/tests/celiac-disease-comprehensive) | Single test | $124.99 | This marker | | [Gut Health Panel](https://www.test-well.com/tests/gut-health-panel) | Panel | $129.99 | 5 tests | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $124.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | No | — | Not offered through Labcorp for this test. | | BioReference (NY & NJ) | Yes | $74.99 | New York and New Jersey orders route here automatically — state rules keep Quest and Labcorp from accepting self-ordered draws. | - [What a high tTG-IgA means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/ttg-iga/high) ## Common questions about tTG-IgA ### Do I need a doctor's order to test my ttg-iga? 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. ### How long does it take to get tTG-IgA results? Most tTG-IgA results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### How much does a tTG-IgA test cost? Our Celiac Disease Panel starts at $124.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted. ### Do I need to fast before my tTG-IgA test? Fasting is not required for the tTG-IgA test. You can have your blood drawn any time of day. ### Which lab will process my tTG-IgA test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Sources - [Mayo Clinic Labs](https://www.mayocliniclabs.com/test-catalog/overview/82587) - [MedlinePlus (NIH) — Celiac Disease Screening](https://medlineplus.gov/lab-tests/celiac-disease-screening/) ## Related biomarkers - [hs-CRP](https://www.test-well.com/biomarkers/hs-crp) - [ESR](https://www.test-well.com/biomarkers/esr) - [C-Reactive Protein](https://www.test-well.com/biomarkers/c-reactive-protein) - [Tryptase](https://www.test-well.com/biomarkers/tryptase) - [Total IgA](https://www.test-well.com/biomarkers/total-iga) - [Rheumatoid Factor](https://www.test-well.com/biomarkers/rheumatoid-factor) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/ttg-iga Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.