When there is a large amount of stored iron, there is less transferrin production, and its saturation reflects the iron stores.57 Among 13 individuals with autoimmune thyroiditis and celiac disease, Meloni et al. observed hypoferritinemia in 46% of them.32 In the present study, all the individuals who were serologically positive for celiac disease presented hypoferritinemia. Here, TF is linked to autoimmune thyroid disease.