âTed Cruz is a liarâ: Marco Rubio becomes Cruzâs latest target in South Carolina. The Rubio campaign is now slamming Cruz for âdishonest push-pollsâ and dirty Facebook tricks in lead up to Saturday. Sophia Tesfaye Follow Skip to Comments.
Cervical length. The length of the cervix is the distance between the internal os and the external os. First-trimester cervical length is greater than 5 cm. The cervical length decrease to less than 34 mm at 28 weeks' gestation. In patients who have had multiple gestations, the cervix is notably shortened.
Cervical length is a better predictor of preterm birth in. women at increased risk, such as those with a history of. spontaneous preterm birth, than in asymptomatic women. at low risk.35,49,87,91â95 In studies of women with a history of. preterm birth, using a cervical length cut-off of 25 to 30 mm.