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5. Intraday Changes and Clinical Applications of Thyroid Function Biomarkers in Healthy Subjects.

Author

Zhang, Yan, Wang, Hua-Li, Zhou, Chao-Qiong, He, Da-Hai, Wu, Feng, Li, Hong-Chuan, Xie, Qian-Rong, Luo, Yu, and Kong, Li-Rui

Subjects
*BIOMARKERS, *TEMPERATURE, *THYROID hormones, *HUMAN research subjects, *ANALYSIS of variance, *TIME, *THYROXINE, *CIRCADIAN rhythms, *MANN Whitney U Test, *INFORMED consent (Medical law), *SEX distribution, *DESCRIPTIVE statistics, *RESEARCH funding, *TRIIODOTHYRONINE, *DATA analysis software, *FRIEDMAN test (Statistics), *LONGITUDINAL method, THYROID disease diagnosis
Abstract

Objective We evaluated the intraday changes of thyroid function biomarkers in healthy subjects to help clinicians diagnose thyroid diseases in appropriate timing. Methods Blood samples were collected from 31 subjects at 0:00, 4:00, 8:00, 12:00, 16:00 and 20:00 on the sampling day and analyzed for thyroid-stimulating hormone (TSH), triiodothyronine (T3), thyroxine (T4), free T3 (FT3), and free T4 (FT4). The intraday concentration changes were analyzed using Friedman's 2-way analysis of variance by ranks. Results The concentrations of TSH, T3, T4, FT3, and FT4 in males were significantly higher than those in females (P  < .01). The obvious peak circadian rhythm of TSH was observed at 0:00 AM with gradual decline thereafter, whereas other biomarkers showed no rhythmic changes. Conclusion Sex differences should be considered in interpreting thyroid function tests. It is important to select the sampling time according to the clinician's diagnostic needs, especially at night when TSH secretion peaks. [ABSTRACT FROM AUTHOR]

Published
2023
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