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Clinical Chemistry 23: 938-941, 1977;
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Clinical Chemistry, Vol 23, 938-941, Copyright © 1977 by American Association for Clinical Chemistry

Triiodothyronine uptake assay with immobilized triiodothyronine antibody as the bound-free separating agent

LH Coleman, B LeMat, V Diel, A Barbieri and J Barrett

Available systems for evaluation of degree of unsaturation of thyroxine- binding globulin are hampered at the bound-free separation step. In current assays, inorganic sorbants or ion-exchange resins are used to separate free 125I-labeled triiodothyronine from that bound to thyroxine-binding globulin. The techniques are laborious, time consuming, and not readily adaptable to total automation. In the assay we describe, triiodothyronine antibody, immobilized on the walls of polypropylene test tubes, is used as the bound-free separating agent in the evaluation of degree of unsaturation of thyroxine-binding globulin. The assay is simplified to four steps; washing, centrifugation, and use of columns are eliminated; and the procedure is readily automatable with existing pipetting equipment. Correlation with existing methods is excellent.




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Copyright © 1977 by the American Association for Clinical Chemistry.