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TSH‐receptor antibody measurement for differentiation of hyperthyroidism into Graves' disease and multinodular toxic goitre: a comparison of two competitive binding assays

OBJECTIVES Graves' disease is characterized by stimulating autoantibodies to the TSH‐receptor (TRAb). The aim of this study was to compare the performance of a new TRAb assay based on competitive binding to recombinant human TSH‐receptors (H‐TRAb) with an assay employing purified porcine TSH‐receptors (P‐TRAb). Furthermore, to evaluate the applicability of the H‐TRAb assay to discriminate between patients with hyperthyroidism due to Graves' disease (GD) and multinodular toxic goitre (MNTG).