The purpose of the investigation is to assess iodine status of pregnant women at week 16 of gestation targeting serum thyroglobulin as a biomarker of iodine deficiency. The investigators aim to assess whether pre-gestational initiation of iodine supplementation is more advantageous in comparison to supplementation start at the time of pregnancy detection.
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Urinary iodine concentration
Timeframe: At subject enrollment
Serum thyroglobulin concentration
Timeframe: At subject enrollment