The research was undertaken to study the prevalence of TSH receptor antibody positivity in patients with type 1 diabetes. A total of 74 subjects with type 1 diabetes were enrolled in this cross-sectional study. Thyroid function test and assessment of thyroid autoimmunity with anti-TPO and TSH receptor antibody were done in all patients. A total of 33 males and 41 females with type 1 diabetes were studied. The prevalence of TSH receptor antibody positivity alone was 18%. The prevalence of thyroid autoimmunity with anti-TPO as a marker was 28%; the prevalence increased to 43% when TSH receptor antibody was also measured. Majority of the subjects with antithyroid antibody positivity were also positive for GAD65 antibodies. As a significant proportion of type 1 diabetic subjects have positivity to TSH receptor antibody, we suggest that larger studies should be conducted to study the benefits of TSH receptor antibody-based screening for thyroid dysfunction in type 1 diabetic subjects. As the TSH receptor antibodies could be of the stimulating or of the blocking type, subjects with antibody positivity could be at risk of developing hyperthyroidism or hypothyroidism.
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