TGM2 and dermatitis herpetiformis, familial: Diagnosis of DH typically involves the detection of specific antibodies, such as IgA anti-tissue transglutaminase (tTG), anti-epidermal transglutaminase (eTG), and anti-endomysial antibodies (EMA), through an enzyme-linked immunosorbent assay (ELISA) and indirect immunofluorescence (IIF).