A radioimmunoassay study and comparison of seasonal variation in plasma triiodothyronine and thyroxine concentrations in normal healthy persons |
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| Authors: | TH.J. Postmes J.C. Van Hout G. Saat P. Willems J. Coenegracht |
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| Affiliation: | Isotope Department, St. Annadal Hospital, MaastrichtThe Netherlands |
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| Abstract: | ![]()
The serum triiodothyronine (T3) and thyroxine (T4) concentration of healthy persons remains almost constant for at least ten months. Fresh serum and serum frozen for two years were compared. The mean difference in T3 concentration is negligible, only 3 ng/100 ml. The radioimmunoassay has a Between Assay Coefficient of 6.3% and is therefore reliable. Results can be obta |
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