Study on the nutritional status of iodine for pregnant women in Guangzhou

Objective To investigate the nutritional status of iodine for pregnant women in Guangzhou.Methods The urinary iodine was measured by spectrophotometer. Content of T 4,TSH in serum was determined by radioimmunoassay(RIA).Results The median of urinary iodine in mid pregnant and later pregnant women was 249.3 and 241.2 μg/L,respectively. The proportions with urinary iodine100 μg/L in mid pregnant and later pregnant women were 4.5% and 12.5%,respectively. The average T 4 level in mid pregnant women was (157.0±66.4)nmol/L,58.2% of them were within 54~174 nmol/L(recommended rang)and 38.8% were above 174 nmol/L. The average T 4 level of later pregnant women was(124.4±59.4)nmol/L,78.3% of them were within 54~174 nmol/L and 13.0% were above 174 nmol/L. The proportion of TSH5 mU/L in mid pregnant was 36.4% and in later pregnant was 81.8%(P0.01).Conclusions The pregnant women in Guangzhou have good nutritional status of iodine. The proportion of TSH5 mU/L in later pregnant women is high(81.8%).