“…According to Ibrahim et al 16 , cervical length assessment by transvaginal ultrasonography in the prediction of preterm birth in patients with threatened preterm labour was highly promising, with sensitivity, specificity, PPV, NPV, and accuracy of 93. Moreover, for prediction of preterm delivery, Abdel-Ghany 17 showed that cervical length <2.5 cm had a sensitivity, specificity, PPV and NPV of 33.3%, 68.2%, 63.2%, and 64.1%, respectively.…”