Structural and functional differences in auto-antibody positive compared to auto-antibody negative hypothyroid...

Area of Science:

• Endocrinology
• Immunology
• Thyroidology

Background:

• Most adult primary hypothyroidism stems from chronic thyroiditis, often involving autoantibodies like anti-thyroglobulin antibody (TgAb) and anti-thyroid peroxidase antibody (TPOAb).
• The clinical characteristics of antibody-negative hypothyroidism remain unclear, necessitating further investigation into its prevalence and features.

Purpose of the Study:

• To determine the prevalence of thyroid-related autoantibodies in patients diagnosed with primary hypothyroidism.
• To compare thyroid structure and hormone levels between antibody-positive and antibody-negative hypothyroidism patients.

Main Methods:

• Retrospective analysis of 804 patients with thyroid abnormalities or enlargement.
• Inclusion of 237 patients with primary hypothyroidism who underwent thyroid antibody testing and ultrasound.
• Categorization of patients into antibody-positive and antibody-negative groups for comparative analysis.

Main Results:

• 34.6% of patients presented with antibody-negative hypothyroidism.
• Positive rates for TgAb and TPOAb were 62.0% and 49.4%, respectively.
• Antibody-positive hypothyroidism was associated with significantly larger thyroid glands (p < 0.05) and higher thyroid-stimulating hormone (TSH) levels compared to antibody-negative cases.

Conclusions:

• The prevalence of antibody-negative chronic thyroiditis is substantial among hypothyroid patients.
• Significant differences in thyroid structure and TSH levels exist between antibody-positive and antibody-negative hypothyroidism.
• Findings offer insights for managing antibody-negative hypothyroid patients, though further research is warranted.