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Abstract Objective: To analyze the application value of different ultrasound methods for measuring cervical length of women with different cervical shapes during the second trimester pregnancy. Methods: The prgnant women with high risk factors of preterm birth who had accepted ultrasound examination were selected as the research objects. According to the cervical morphology, they were divided into the group A (women with straight cervix) and group B (women with unstraight cervix). The cervical length of all included women was measured by transperineal straight line method and transperineal track method. And the cervical length and the predictive efficacy for preterm labor were compared between the two different methods. Results: There was no significant difference in the cervical length of women in group A between the two different measurement methods (P>0.05). In group B, the the cervical length measured by transperineal track method was significant longer than that of women by transperineal straight line method (P<0.001). As for women with cervical length less than 2.5 in group A, there was no significant difference in the rate of preterm labor between the two different methods (P>0.05). As for women with cervical length less than 2.5 in group B,the rate of preterm labor of women mearsued by transperineal track method was significant higher than that of women mearsued by transperineal straight line method (P<0.05). There were no significant difference in the sensitivity, the specificity, the positive predictive value, and the negative predictive value for predicting preterm labor of women in group A between the two different methods (P>0.05). In group B, the sensitivity, the specificity, the positive predictive value, and the negative predictive value for predicting preterm labor of women mearsued by transperineal track method were significant higher than those of women by transperineal straight line method (P<0.05). Conclusion: As for women with straight cervix, the cervical length and the prediction value of preterm labor by transperineal straight line method and transperineal track method were in good consistency. And As for women with unstraight cervix, the measured cervical length by transperineal track method was more accurate than that by transperineal straight line method, and the value for predicting preterm labor was better than that by transperineal straight line method. There was no significant difference in the cervical length between measured through perineum and transvaginal measurement.
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