ObjectiveTo investigate the iodine nutrition status after down regulation of the standard of iodized salt in optimal iodine regions among residents in Shanghai Songjiang district, and provide a scientific basis for future scientific iodine supplement.

MethodsA total of 450 children from 8 to 10 years old (half boys and half girls)and 200 pregnant women(in early, middle, and late pregnancies, each 1 / 3) were selected according to stratified random sampling extraction, and their urine and edible salt of all respondents were collected, while the quantitative determination was used for the urine iodine and salt iodine content. Palpation method was used to check the goiter in 250 children.

ResultsAfter overall consumption of lower standard of iodized salt, the goiter rate of children was 3.20%; the median of urinary iodine and salt iodine among the children were 200.05 μg/L, 24.85 mg/L, respectively; 82.66% of children had their iodine nutrition in suitable condition (100～299 μg/L), 12.67% of children had their urinary iodine concentration over 300 μg/L; there were significant differences of urine iodine frequency distribution between different gender and age groups (P < 0.05).The median of urinary iodine and salt iodine among the pregnant women were 165.90 μg/L, 25.40 mg/L, respectively; 60.00% of pregnant women iodine nutrition was appropriate (150～499 μg/L); the proportion of iodine deficiency was far more than the proportion of iodine excess, and there were significant differences among different direction(P < 0.05).

ConclusionThe iodine nutrition level of children is slightly higher than the appropriate range, while the iodine nutrition level of pregnant women is at lower limit of iodine nutrition level in a suitable range. There is a lack of iodine nutrition risk in pregnant women, so richer iodine food is needed under professional guidance for them to ensure their iodine nutrition levels.