AI Article Synopsis
- A solid-phase radiometric assay was created to measure thyroglobulin autoantibodies (TgRA) and compared to other methods in patients with various thyroid conditions.
- In a study involving normal subjects and patients with Hashimoto's thyroiditis and other thyroid disorders, TgRA revealed a mean ratio of 0.93 in normal individuals.
- The findings suggested that while TgRA is more sensitive than the hemagglutination method (TgHA) for detecting antibodies, it is less sensitive than another hemagglutination method (MCHA) for diagnostic purposes.
Article Abstract
A simple solid-phase radiometric assay for the measurement of thyroglobulin autoantibodies (TgRA) was developed and evaluated. The assay is semiquantitative, and the results were expressed as a ratio between sample versus negative control (normal human serum). In 59 normal subjects, the mean ratio was 0.93 +/- (SD) 0.34. Thyroglobulin antibodies by radiometric assay, by hemagglutination (TgHA), as well as microsomal antibodies by hemagglutination (MCHA) were measured in 41 patients with a histopathologic diagnosis of Hashimoto's thyroiditis (n = 22), adenomatous goiter (n = 10), carcinoma (n = 5), adenoma (n = 4), and in 59 patients without histopathologic diagnosis of thyroid disease. In patients with Hashimoto's thyroiditis, TgRA, TgHA, and MCHA were positive in 54, 31, and 81% of patients, respectively. 1 patient had positive TgRA with negative MCHA levels, and 2 had negative antibody titers by all methods. Thyrotropin-stimulating hormone levels were elevated (greater than 10 microU/ml) in 17 of these patients. Our results suggest that although the TgRA method is more sensitive than TgHA for detecting thyroglobulin antibodies, its diagnostic sensitivity is not equal to that of MCHA.
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