Compositions, methods and kits are provided for performing assays for a thyroid peroxidase autoantibody. Solution-stable, indirectly labeled, preferably with an acridinium ester, thyroid peroxidase molecules, portions thereof or synthetic analogs thereof are provided for use with the kits and automated assay platform, using cartridges containing the inventive compositions which provide adequate shelf-life to make practical the production, shipping and storage of the cartridges for users of the automated assay platform.
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