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Comparison of free thyroxine measurement by chemiluminescence and equilibrium dialysis following 131I therapy in hyperthyroid cats.

Lisa StammeleerEva BuresovaEmmelie StockLaurien FeenstraEva VandermeulenLuc DuchateauIsabel Van de MaeleSylvie Daminet
Published in: Journal of feline medicine and surgery (2020)
Good correlation exists between both assays at T1 and T2, but a significant systematic difference is noted at both time points. This could be an indication for reconsideration of the current RI, although further studies are warranted for assessing test accuracy (in otherwise healthy cats and cats with non-thyroidal illness). At this time, routine use of fT4CEIA after 131I therapy is not advised in feline patients.
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