LOINC® Map Order CodeOrder Code NameOrder LoincResult CodeResult Code NameUofMResult LOINC 164640 t-Transglutaminase (tTG) IgA 31017-7 164643 t-Transglutaminase (tTG) IgA U/mL 31017-7Labcorp About Us Newsroom Careers opens in a new tab Investors opens in a new tab FAQs Labs Test ...