8. Conclusion

Even though UIMM, a spectrophotometrical method, is less sensitive compared to the sophisticated methods such as the ICP-MS, the same process of quality system applies to the latter as well. Since urinary iodine is easily evaporated, careful measures have to be made in all preanalytical and analytical procedures to minimize it. The quality system is supported by detailed documentation and glassware cleaning in the post-analytical procedures. IQC and EQA programs are very important to enhance validity of respondent results to be released to the IDD program managers in monitoring the population iodine status. Urinary iodine estimation is vital to maintain effectiveness of the USI program in eliminating IDD worldwide. This chapter is hoped to be a guide to all urinary iodine laboratories in understanding quality control in urinary iodine estimation.
