[Local data] The first city-wide iodine survey in Hong Kong

[Local data] The first city-wide iodine survey in Hong Kong

The Department of Health has commissioned the Chinese University of Hong Kong to conduct a survey on iodine, aiming to evaluate iodine status among local school-aged children (n = 1,023), pregnant (n = 1,513) and lactating (n = 482) women.

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Questionnaire interviews and spot urine iodine tests were performed for all subjects whereas thyroid ultrasonography was done for school-aged children. Key findings are listed below:

 

  • School-aged children
    • Median urinary iodine concentration (UIC) was 115 mcg/L (classified as “adequate” iodine intake as per the cut-off points recommended in the WHO’s Guide)
    • Total goitre rate assessed with body surface area-specific reference values and age-specific reference values (1.7% and 2.2% respectively) were within the category of “none” degree for iodine deficiency as per the prevalence of goitre by WHO
       
  • Pregnant women
    • Median UIC was 134 mcg/L (classified as “insufficient” iodine intake*)
    • Median UIC of women taking iodine-containing supplements at an average daily iodine intake of at least 150 mcg/day was 156 mcg/L (classified as “adequate” iodine intake*)
       
  • Lactating women
    • Median UIC was 65 mcg/L (classified as “insufficient” iodine intake*)
    • Median UIC of lactating women taking iodine-containing supplements at an average daily iodine intake of at least 150 mcg/day was 84 mcg/L (classified as “insufficient” iodine intake*)  

 

* According to the WHO classification

 

Link to the full report:
https://www.chp.gov.hk/files/pdf/iodine_survey_report_en.pdf
 

WYE-EM-162-SEP-21

Reference

Hong Kong Department of Health. Iodine survey report. August 2021.
 

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[Local data] A local report on iodine status of pregnant women during early gestation