Objective:To learn about the changing trend of iodine deficiency disorders (IDD) and the iodine nutrition level of key populations in Fuzhou.Methods:From March 2017 to October 2019, a cross-sectional survey method was used to carry out IDD monitoring among key populations in 12 counties (cities, districts) of Fuzhou. In each county (city, district), one township/street was selected from five directions: East, West, South, North and Middle. Forty non-boarding children aged 8-10 (age balanced, half male and half female) from one primary school and 20 pregnant women in each township/street were selected as the survey subjects. The edible salt samples and instant urine samples of children and pregnant women were collected to detect the contents of salt iodine and urinary iodine; the thyroid volume of children was measured by B-ultrasound, and the goiter rate was calculated.Results:From 2017 to 2019, a total of 7 479 edible salt samples were collected from children's homes, and the median salt iodine was 23.40 mg/kg, the coverage rate of iodized salt was 94.06% (7 035/7 479), the qualified rate of iodized salt was 97.70% (6 873/7 035), and the consumption rate of qualified iodized salt was 91.90% (6 873/7 479). A total of 3 602 edible salt samples were collected from pregnant women's homes, and the median salt iodine was 23.69 mg/kg, the coverage rate of iodized salt was 94.73% (3 412/3 602), the qualified rate of iodized salt was 97.66% (3 332/3 412), and the consumption rate of qualified iodized salt was 92.50% (3 332/3 602). A total of 7 479 urine samples were collected from children, and the median urinary iodine was 172.70 μg/L. A total of 3 602 urine samples were collected from pregnant women, and the median urinary iodine was 131.21 μg/L. A total of 7 479 cases of thyroid gland in children were examined, including 89 cases of goiter, and the goiter rate was 1.19%.Conclusions:The consumption rate of qualified iodized salt ( > 90%) of key populations, urinary iodine (100-< 200 μg/L) and goiter rate ( < 5%) of children in Fuzhou are all in line with the national standard for elimination of IDD, but pregnant women are at risk of iodine deficiency (urinary iodine < 150 μg/L).

Objective:To investigate the iodine nutrition status of key population in Fuzhou City, and to provide scientific basis for adjusting intervention strategies.Methods:From March to October 2021, a survey was conducted on iodine nutrition status of key population in 12 counties (cities, districts) of Fuzhou City. Each county (city, district) was divided into 5 sampling areas according to the east, west, south, north and middle directions. One township (street) was selected from each area, and 40 non-boarding children aged 8 - 10 (age balanced, half male and half female) from one primary school and 20 pregnant women (early, middle and late pregnancy balanced) were selected as survey subjects. Household salt samples and random urine samples were collected, and the salt iodine and urine iodine levels were tested by direct titration and arsenic and cerium catalytic spectrophotometry, respectively. Children's thyroid volume was measured by B-ultrasonography. At the same time, in cooperation with Fuzhou Maternal and Child Health Hospital, the thyroid stimulating hormone (TSH) testing results of heel blood of full-term natural delivery newborns in Fuzhou City in 2021 were collected.Results:A total of 2 400 children were monitored for salt iodine, urine iodine and goiter. The median salt iodine was 24.40 mg/kg, with an iodine salt coverage rate of 93.04% (2 233/2 400), a qualified rate of iodized salt of 97.40% (2 175/2 233), and a consumption rate of qualified iodized salt of 90.62% (2 175/2 400). The median urine iodine was 181.47 μg/L. The rate of goiter was 1.04% (25/2 400). A total of 1 200 pregnant women were monitored for salt iodine and urine iodine. The median salt iodine was 24.10 mg/kg, the coverage rate of iodized salt was 91.08% (1 093/1 200), the qualified rate of iodized salt was 97.90% (1 070/1 093), and the consumption rate of qualified iodized salt was 89.17% (1 070/1 200). The median urine iodine was 128.10 μg/L. The median TSH level in the heel blood of 14 242 newborns was 3.38 mU/L, and the proportion of TSH level > 5 mU/L was 30.96% (4 410/14 242).Conclusions:In 2021, children in Fuzhou City are at an appropriate level of iodine, but pregnant women are insufficient of iodine. We should continue to maintain comprehensive prevention and control measures mainly based on salt iodization, provide health education for pregnant women, and strengthen monitoring of TSH level in newborns.