Objective To investigate the prevalence of thyroid disorders and positive thyroid autoantibodies,and evaluate the necessity for universal thyroid screening during the second and third trimesters of pregnancy.Methods The pregnant women during the second and third trimesters who visited Shanghai Jiaotong University Affiliated First People's Hospital between June 2006 and February 2008 were chosen for thyroid screening by determining serum free triiodothyronine,free thyroxine,thyrotropin,thyroid peroxidase antibody (TPOAb),and thyrotropin receptor antibody.A personal and family history of thyroid disease and other autoimmune diseases was investigated by questionnaire.The pregnant women were divided into high risk or low risk groups for thyroid disease based on their personal or family histories.Results A total of 2 101 pregnant women were screened,712 ( 33.89％ ) of them were identified to suffer from thyroid disorders or with positive thyroid autoantibody.The prevalence of thyroid dysfunction was increased in high risk group.While in low risk group( n =1 983 ),the prevalence of clinical hypothyroidism was 2.27％ ( n =45 ),subclinical hypothyroidism 11.60％ ( n =230 ),clinical hyperthyroidism 0.20％ ( n =4 ),subclinical hyperthyroidism 1.06％ ( n =21 ),hypothyroxinemia 6.45％ ( n =128 ),and euthyroid with positive TPOAb 10.74％ ( n =213 ) in our study.Pregnant women with positive TPOAb were susceptible to thyroid dysfunction.It was shown that 79.74％ of pregnant women with thyroid disorders were diagnosed by universal thyroid screening.Conclusions 33.89％ of pregnant women in the second and third trimesters were identified to suffer from thyroid disorders or positive thyroid autoantibody by universal thyroid screening.Increased prevalence of thyroid dysfunction was found in pregnant women with positive TPOAb.79.74％ of pregnant women with thyroid disorders might be missed if screening was made only in the high risk cases.

ObjetiveTo investigate the obstetrical and neonatal outcomes of pregnant women with hypothyroidism or subclinical hypothyroidism.MethodsOne hundred and sixty-eight pregnant women with clinical or subclinical hypothyroidism during pregnancy,including 9 controlled hypothyroidism,29 uncontrolled hypothyroidism and 130 subclinical hypothyroidism,were enrolled in this study.The general clinical information,obstetrical complications and neonatal outcomes of these pregnant women were compared with that of 180 healthy pregnant women who delivered during the same period.ResultsCompared with control group,there were no significant differences in the levels of serum free triiodothyronine( FT3 ),free thyroxine ( FT4 ),thyrotropin-stimulating hormone (TSH) in the controlled hypothyroidism group in the third trimester [(3.68 ±1.11 ) pmol/L vs (3.19 ±0.33) pmol/L,(15.48 ±4.14) pmoL/L vs (13.95 ± 1.68) pmol/L,1.87 mU/L vs 1.76 mU/L,P ＞0.05].However,in the second and third trimester,the levels of FT3,FT4 in the uncontrolled hypothyroidism group were lower,while the levels of TSH were higher than in control group [(2.71 ±0.80) pmol/L vs (3.14 ± 0.34) pmoL/L,(10.94 ± 2.68) pmol/L vs (14.25 ±2.01) pmol/L,5.62 mU/L vs 2.28 mU/L,( 2.34 ± 0.70 ) pmol/L vs ( 3.19 ± 0.33 ) pmol/L,( 10.16 ± 1.65 ) pmol/L vs (13.95 ± 1.68) pmoL/L,7.13 mU/L vs 1.76 mU/L,t =2.754～9.15,P ＜0.01],the levels of TSH in the subclinical hypothyroidism were higher than in control group ( t =18.28,18.57,P ＜0.01 ).There was no adverse perinatal outcome of neonate happened in controlled hypothyroidism group.In contrast,the incidences of adverse perinatal outcomes and complications in the uncontrolled hypothyroidism group were higher than that in the control group ( 17.2％ vs 2.8％,37.9％ vs 5.6％,x2 =11.47,28.97,P ＜0.01 ).Compared with that of control group,the incidences of adverse obstetrical outcomes in pregnant women with subclinical hypothyroidism were increased (40.0％ vs 5.6％,x2 =52.97,P ＜ 0.01 ).ConclusionsThe rate of adverse obstetrical outcomes and complications is increased in women with clinical or subclinical hypothyroidism.But the incidence of adverse outcomes would decrease if hypothyroidism is controlled by treatment.