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Objectives: To determine if low cervical volume predicts risk of spontaneous preterm birth in preterm contraction pregnancy. Study design: A prospective study that measured cervical volume by transvaginal XI VOCAL was performed among 100 patients with a singleton pregnancy hospitalized with signs of premature labor between 24 and 36 weeks' gestation. Result: The rate of preterm birth was 32.2%. The sensitivity, specificity of transvaginal XI VOCAL were, respectively, 72.2%, 65.3% for delivery before 37 weeks' gestation. When cervical volume was ≤ 17 CC, the gestational age at delivery was significantly lower than when it exceeded 17 CC (P < 0.05). Conclusion: Transvaginal XI VOCAL in cervical volum measurement provides an objective method for evaluating the risk of preterm delivery. Its predictive values are impressive and allow better discrimination between women at high risk of preterm delivery and those in false preterm labor.

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