Sensitive radioimmunological screening test for antithyroglobulin autoantibodies

Area of Science:

• Endocrinology
• Immunology
• Clinical Chemistry

Background:

• Anti-thyroglobulin autoantibodies can interfere with accurate human thyroglobulin measurements.
• Reliable thyroglobulin determination is crucial for diagnosing and monitoring thyroid conditions.

Purpose of the Study:

• To develop and validate a screening test for anti-thyroglobulin autoantibodies.
• To ensure the suitability of samples for accurate radioimmunoassay-based thyroglobulin determination.

Main Methods:

• A radioimmunoassay utilizing 125I-thyroglobulin and goat anti-human gamma-globulin was employed.
• A 30-minute incubation allowed autoantibody binding, followed by a 2-hour precipitation incubation.

Main Results:

• Samples with autoantibodies showed significant binding of radiolabeled thyroglobulin.
• Samples devoid of autoantibodies, suitable for valid thyroglobulin tests, bound less than 6% of the radiolabeled thyroglobulin.
• The radioimmunoassay demonstrated superior sensitivity compared to the tanned-erythrocyte hemagglutination test.

Conclusions:

• The developed radioimmunoassay serves as an effective screening tool for anti-thyroglobulin autoantibodies.
• This screening method enhances the reliability of human thyroglobulin measurements by excluding interfering autoantibodies.