Endocrine Abstracts

Objective: The aim of this study was to examine the urinary iodine concentrations (UIC) in an adult population in the Faroe Islands. Iodine status in the adult population assumed to be sufficient due to the high frequency of seafood consumption1 although UIC has not been investigated previously in the Faroe Islands. World Health Organization recommends monitoring iodine status in all populations. Iodine nutrition is a key determinant of thyroid disease risk

Design: A population-based cross-sectional survey was conducted in 2011–2012 a sub-group donated a urinary sample. We measured iodine concentrations in 491 participants, 294 men and 197 women aged 40–74 years.

Methods: Urine samples were stored at minus 80 degrees Celsius. Iodine level is determined in microgram/liter (mg/l) by the ceri/arsen method after alkaline ashing.

Results: The median UIC was 101 mg/l (21 to 1870 mg/l). Severe deficiency did not occur in this study group (UIC, < 20 mg/l); 10% of the participants were moderate insufficient (UIC < 50 mg/l). In total 36% were in the target range (UIC, 100–199 mg/l) but 38% were mild insufficient. Nearly 15% had higher levels than recommended (UIC ≥ 200 mg/l). Smoking habits did not affect the results. There was not significantly differences in age groups as seen in other studies. Overall UIC was significantly higher in males 115 mg/l than females 86 mg/l (P < 0×001).

Conclusion: It is important not only that the median iodine intake is sufficient, but also to consider the total iodine exposition in the population. With nearly half, the study population moderate to mild deficient as determined by WHO criteria especially the status in females could be a cause for concern. Health authorities need to form an opinion about and taking a position on Iodization program and regular assessment of iodine nutritional status is needed.