Abstract
A robust, rapid, sensitive and specific enzyme-linked immunosorbent assay (ELISA), using an in-house immunoglobulin-A-sub-class mouse monoclonal human-thyroglobulin antibody (WNSM2), with a sensitivity of 1.51 pmol/l has been established for the measurement of thyroglobulin in serum. Standard curves in varying dilutions of human serum were similar to standard curves obtained in serum-free medium, thus demonstrating no significant cross-reactivity with any serum proteins other than thyroglobulin. Levels of serum thyroglobulin detected by ELISA correlated significantly (r = 0.93, P less than 0.001) with those from a standardized and well-characterized radioimmunoassay. The coefficients of variation within and between ELISA assays were 3.9 and 7.1% respectively. Thyroglobulin was detectable in 87% of 54 normal subjects who had no history of thyroid or autoimmune disease, the mean (+/- S.D.) for this group being 15 +/- 6.6 pmol/l with a range of 1.51-53 pmol/l. Using this assay, levels of thyroglobulin were shown to be significantly (P less than 0.002) increased in patients with untreated hyperthyroid Graves' disease compared with normal subjects.
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