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Updated: Oct 5, 2025

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Published on: May 16, 2014
Validation of a Spectrophotometric Method for Urinary Iodine Determination on Microplate Based on Sandell-Kolthoff
Adrijana Oblak1, Petra Arohonka2, Iris Erlund2
1Department of Nuclear Medicine, University Medical Centre Ljubljana, Ljubljana, Slovenia.
Objective:
Iodine is an essential part of the thyroid hormones thyroxine and triiodothyronine. Therefore, it is essential to monitor iodine supply in a population. The biochemical marker for assessing and controlling iodine is urinary iodine concentration (UIC).
Materials And Methods:
This cross-sectional study included 180 pregnant women and 308 women of reproductive age. Urine specimens from 185 of the 488 volunteers were used. The urine specimens were measured using 2 methods: (1) ammonium persulfate digestion (APD), followed by the Sandell-Kolthoff (S-K) reaction modified on microplate for spectrophotometric detection; and (2) the reference method, inductively coupled plasma mass spectrometry (ICP-MS).
Results:
The regression equation between the methods was ICP-MS method = 1.137*(APD S-K)-5.57. A Passing-Bablok regression showed no deviation from linearity (P = .17). A Bland-Altman plot showed a negative mean bias of -2.7%.
Conclusion:
The APD S-K reaction modified on microplate for spectrophotometric detection of UIC can be implemented into routine work. Its results are comparable to those of laboratories worldwide and to ICP-MS.
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