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This letter is regarding the recent publication of ‘Assessment of thyroid function in children, adults and pregnant and lactating women after long-term salt iodisation measurements’ by Su et al.(1). The findings presented by the authors are both relevant and interesting to the iodine research conducted in China. The cross-sectional study covered six different provinces located in the northern, central and southern regions of China; however, some regions such as Xinjiang (northwest region), Qinghai (northwest region) and Yunnan (southwest region) were not included. For example, Xinjiang is classified as iodine excessive region. Overall, the findings by the authors have provided some valuable information especially the use of thyroglobulin (Tg) to assess iodine status in children, adults, pregnant and lactating women living in China.

I would like to highlight the use of Tg by the authors in the assessment of iodine status …