Background: Recent studies have found, in both developed and developing countries, there is still a considerable number of pregnant women in iodine deficiency status. Our overall aim is to monitor iodine status of pregnant women in China, and to examine the correlation between maternal urine iodine concentration (UIC) and newborn physical development level.~Design: prospective cohort study~Methods: During August - December 2015,250 participants(28-32 weeks' gestation) were selected to participate in the study.The investigators collect the spot urine samples(n=750) once every two weeks.~Setting: Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine.~Participants: 150 normal pregnant women and 100 pregnant women with gestational diabetes (28-32 weeks' gestation) and their newborns were selected to participate the study.
Recent studies have found, in both developed and developing countries, there is still a considerable number of pregnant women in iodine deficiency status.Our overall aim is to monitor iodine status of pregnant women in China, and to examine the correlation between maternal urine iodine concentration (UIC) and newborn physical development level.