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Iodine Survey

Iodine Survey


Iodine is an essential micronutrient affecting cellular metabolism, growth and development, especially of the brain. The Department of Health (DH) is commissioning the Chinese University of Hong Kong (CUHK) to conduct an Iodine Survey to assess the iodine status of three population subgroups in Hong Kong.


This survey will collect data from school-aged children, pregnant women and lactating mothers and to determine the prevalence of goiter in school-aged children.


Around 1,000 school-aged children, 1,500 pregnant women and 500 lactating women will be recruited from Student Health Service Centres and Maternal and Child Health Centres under DH, or from other health care institutions. They will be approached by interviewers who will explain the survey before obtaining their consent to join.

Data Collection Period

Fieldwork will be carried out from January 2019 to November 2019.

Verification of Interviewer’s Identity

All interviewers will produce an interviewer identification card issued by DH. For enquiries, please call -

  • CUHK enquiry hotline (for school-aged children): 3763 6135  (Monday to Friday from 09:00 to 17:00)
  • CUHK enquiry hotline (for pregnant women and lactating mothers): 3505 1536  (Monday to Friday from 09:00 to 17:00)
  • DH enquiry hotline: 2202 4093 (Monday to Friday: from 09:00 to 13:00 and from 14:00 to 17:30)

Information to be Collected

Data regarding current health condition, medical history and food intake history will be collected through a structured questionnaire. A urine sample will be collected for analysis of iodine excretion. School-aged children will have their body height and weight measured as well as receive an ultrasound scan of the thyroid gland.

Handling Collected Data

All data collected will be used only for research and statistical purposes. Survey results will be released in aggregated form. All personal data will be kept strictly confidential and disposed of safely within 6 months after completion of the survey. Requests for access and correction of personal data should be made to one of the enquiry numbers stated above.