Results
Thyroid function of 480 clinical euthyroid Thai pregnant women was studied. Mean maternal age was 29.7 years (range 13-44 years). The total prevalences of abnormal THS and TPO-Ab in Thai pregnancies were 9.79% (n=47) and 13.96 % (n=68) respectively. Abnormal value of TSH and anti-TPO were classified according to maternal age groups (figure1). The highest frequency of abnormal thyroid function either TSH or TPO-Ab was found in 30-34 year-old age group. However, the correlation between THS level and maternal age was not found (r=0.004,p=0.49) Although there is no statistical difference, the highest prevalence of abnormal TSH level was found in the pregnancies in the first trimester while the highest prevalence of TPO-Ab was presented in pregnant the second trimester (Figure 2). About abnormality of TSH level are both abnormal high (2/47 cases,4.3%) and iow (45/47 cases, 95.7%) level. interestingly, TSH level was significantly higher. In the pregnant women with TPO-Ab positive compared to the ones with TPO-Ab negative group (Figure 3).