Study on the high risk value of TSH in pregestational women / 中华内分泌代谢杂志

ABSTRACT

Objective To analyze the relationship of the serum concentration of TSH in pregestational women with pregnancy and pregnant outcome,and to investigate the high risk value of TSH in eugenic and healthy examination before pregnancy.Methods The distribution of TSH in fertile woman and the relationship of serum TSH level with sex hormone levels,rate of pregnancy,and adverse pregnant outcomes (no healthy infants were born,abortion,premature delivery,and malformation) were investigated in national-free pregestational eugenic and healthy examination during 2013.The high risk level of TSH in pregestational women was determined.Results The average level of TSH in 5 798 prepregnant women was 2.36 mIU/L with the median of 2.01 mIU/L,and the serum level of TSH showed abnormal distribution with long tail.The pregnant rate of fertile women within one year was 76.1％.The beneficial range of TSH levels for pregnancy was 0.35-3.5 mIU/L,while the pregnant rate in other ranges of TSH level was decreased with statistically significant difference (P＜0.01).When the concentration of TSH was below 0.35 mIU/L or above 5.5 mIU/L,abnormal pregnant outcomes were significantly increased (P＜0.01).Logistic regression analysis indicated that the relative risks of infertility and abnormal pregnant outcomes were significantly increased.Compared with TSH 0.35-2.5 mIU/L group,there were significantly differences in FSH,LH,and estradiol (E2) in TSH＞4.5 mIU/L or＜0.35 mIU/L group (P＜0.01).TSH was related with LH,E2,progesterone,and prolactin (r=0.29,-0.28,-0.37,0.36).Conclusion The high risk value of serum TSH in prepregnant women should be below 0.35 mIU/L or above 5.5 mIU/L.