RESUMO
Objective To analyze the relationship between the urine iodine level in different pregnant periods of women and the thyroid function .Methods The pregnant women were randomly sampled in Foshan city and 490 cases were selected as the research subjects ,including 170 cases of early stage pregnancy ,162 cases of middle stage pregnancy and 158 cases of late stage pregnancy . According to the thyroid function ,490 subjects were divided into the normal thyroid function group and the abnormal thyroid func‐tion group .Results 140 cases(88 .61% ) in the late stage pregnancy had normal thyroid function ,which were less than 166 cases (97 .65% ) in the early stage pregnancy and 157 cases (96 .91% ) in the middle stage pregnancy ;the constituent ratio of urine iodine < 100 μg/L in the early stage pregnancy was 19 .88% (33/166) in the normal thyroid function ,which was lower than 75 .00%(3/5) in the abnormal thyroid function group .The constituent ratio of urine iodine 100 - 300 μg/L in the early stage pregnancy group was 56 .0% (93/166) ,which was higher than 0 .0% (0/4) in the of abnormal thyroid function group .Conclusion It is neces‐sary to conduct the urinary iodine monitoring in early pregnant woman ,moreover it is suggested that the thyroid function detection will be conducted in the pregnant women with urine iodine < 100 μg/L and urine iodine 100 - 300 μg/L .