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central sensitivity indices include the thyrotroph thyroxine resistance index (TT4RI) and TSH index (TSHI). The FT3/FT4 ratio reflects deiodinase activity and is a proxy for peripheral thyroid hormone sensitivity ( 21 ). Central resistance phenomena affect
Department of Endocrinology, Shengjing Hospital, China Medical University, Shenyang, Liaoning, China
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Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Heping District, Shenyang, Liaoning, China
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Department of Endocrinology, Shengjing Hospital, China Medical University, Shenyang, Liaoning, China
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sensitivity index (TT4RI) was calculated as: fT4 (pmol/L) · TSH (mIU/L) ( 11 ). The TSH index (TSHI) was calculated as: ln TSH (mIU/L) + 0.1345 · fT4 (pmol/L) ( 14 ). The TFQI is achieved by applying the population empirical cumulative distribution