{"id":"ttg-igg","name":"Tissue Transglutaminase (tTG) IgG","shortName":"tTG IgG","aliases":["tTG IgG","Transglutaminase IgG","Tissue Transglutaminase IgG","TTG IgG Ab","tTG Antibody IgG","Tissue Transglutaminase Ab IgG","Tissue Transglutaminase Antibody, IgG","Tissue Transglutaminase Antibody (IgG)","Tissue Transglutaminase (tTG) Antibody (IgG)","Tissue Transglutaminase (tTG) Ab, IgG","t-Transglutaminase (tTG) IgG","Tissue Transglutaminase Ab, IgG, S","tTG, IgG","TG2 IgG","Transglutaminase 2 IgG","Anti-tTG IgG","Anti-tissue Transglutaminase IgG","TTG G"],"abbreviations":["tTG IgG","tTG-IgG","TTG IgG","TG2 IgG","TGA-IgG"],"loinc":[{"code":"32998-7","primary":true},{"code":"56537-4","primary":false},{"code":"53026-1","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). Mayo Clinic Laboratories uses lower cutoffs (below 6.0 U/mL negative, 6.0 to 9.0 weak positive, above 9.0 positive). 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), IgG (test 164988)","url":"https://www.labcorp.com/tests/164988/tissue-transglutaminase-ttg-igg","publisher":"Labcorp"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood test for IgG antibodies to tissue transglutaminase, a gut enzyme. It is used for celiac disease testing mainly when IgA is low or missing.","url":"https://bloodtesttracker.com/markers/ttg-igg","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}