TGM2 and selective IgA deficiency disease: Additional labs included negative human leukocyte antigen (HLA)DQ2 and DQ8, IgG celiac screen, given the patient’s selective IgA deficiency (normal tissue transglutaminase IgG, endomysial antibody IgG, gliadin IgG), normal ESR, CRP, thyroid stimulating hormone, free T4, and fecal calprotectin.