1.3. IDD monitoring and determination of median urinary iodine of population

Urinary iodine testing is mandatory before any intervention implementation and in monitoring the universal salt iodization (USI) programs. Urinary iodine laboratories are responsible to perform the urinary iodine testing on respondent samples in determining the population median values. Even though the target group to determine median urinary iodine is schoolchildren aged 8–10 years old, various researches were also done on pregnant women and followed up with their babies to investigate the relationship between iodine status during pregnancy and the babies' IQ [3]. Thus, quality control throughout the laboratory performance is of utmost importance to ensure that the results obtained are valid and reliable to generate accurate reports.
