{"id":"ttg-iga","name":"Tissue Transglutaminase (tTG) IgA","shortName":"tTG IgA","aliases":["tTG IgA","Tissue Transglutaminase IgA","Transglutaminase IgA","Tissue Transglutaminase Antibody, IgA","TTG IgA Ab","tTG Antibody IgA","Tissue Transglutaminase Ab IgA","Anti-tTG IgA","Tissue Transglutaminase Antibody (IgA)","Tissue Transglutaminase (tTG) Antibody (IgA)","Tissue Transglutaminase (tTG) Ab, IgA","t-Transglutaminase (tTG) IgA","Tissue Transglutaminase Ab, IgA, S","tTG, IgA","TG2 IgA","Transglutaminase 2 IgA","Anti-tissue Transglutaminase IgA","Anti-tTG Antibody IgA","TTG A","Celiac tTG IgA"],"abbreviations":["tTG IgA","tTG-IgA","TTG IgA","TG2 IgA","TGA-IgA"],"loinc":[{"code":"31017-7","primary":true},{"code":"46128-5","primary":false},{"code":"35285-6","primary":false},{"code":"35280-7","primary":false}],"specimen":"serum","units":[{"ucum":"[arb'U]/mL","display":"U/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":10,"unit":"[arb'U]/mL","unitDisplay":"U/mL","note":"Labcorp lists a reference range of 0.0 to 10.0 U/mL (negative below 7.0, equivocal 7.0 to 10.0, positive above 10.0; fluoroenzyme immunoassay), and Mayo Clinic Laboratories also calls above 10.0 U/mL positive (negative below 4.0, weak positive 4.0 to 10.0). Cutoffs are kit-specific and not interchangeable: Quest's immunoassay reports below 15.0 U/mL as 'antibody not detected', and ARUP reports a different scale (fluorescent light units, FLU) with 0.00 to 4.99 FLU as negative. A result inside this range can still carry a weak-positive or equivocal label from the lab. Use the cutoff and flag printed on your own report.","sources":[{"title":"Tissue Transglutaminase (tTG), IgA (test 164640)","url":"https://www.labcorp.com/tests/164640/tissue-transglutaminase-ttg-iga","publisher":"Labcorp"},{"title":"Tissue Transglutaminase Antibody, IgA, Serum (test TTGA)","url":"https://www.mayocliniclabs.com/test-catalog/overview/82587","publisher":"Mayo Clinic Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood test for antibodies to tissue transglutaminase, a gut enzyme. It is the main blood test used when celiac disease is suspected.","url":"https://bloodtesttracker.com/markers/ttg-iga","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}