Objectives: Primary hypothyroidism in iodine-replete areas is commonly caused by chronic autoimmune thyroiditis and is typically manifested as Hashimoto thyroiditis (HT). The association between endocrinological diseases and ABO blood group (BG) has been investigated in very few studies. This study was conducted to investigate whether there is a relationship between HT and ABO BG. Methods: Patients who were followed up in outpatient clinics with a diagnosis of hypothyroidism and who had elevated anti TPO antibodies, decreased T4 and TSH levels above 10 mU/ml were included in the study. Patients who were admitted to the outpatient clinic for any reason, who did not have a diagnosis of HT, and whose BG were checked were included as the control group (CG). Results: 851 HT patients were included in the study. A total of 155977 individuals included as the CG. HT patients BG 0 group consisted of 317 (37.3%) individuals. HT patients with BG 0 had a higher risk of HT (OR 1.18 1.02-1.35 p=0.023). Conclusion: BG 0 was detected more frequently in individuals with HT. We can emphasize that BG 0 is more frequent in diseases associated with autoimmunity and connective tissue origin. Keywords: ABO blood groups, Hashimoto thyroiditis, hypothyroidism
Corresponding Author: Huseyin Kurt