Is it normal to have 2.5 cms cervical length during 18 weeks of pregnancy?

Answer 1

During pregnancy, a woman's cervix can measure between 2.5 - 4.0 cm with the average being close to 3.0 cm. As the due date approaches, the cervix becomes shorter (effacement). At 18 weeks, you probably had your cervix measured during your level 2 sonogram. If you are concerned that your length is a little lower than the average, you can get a second opinion. There can be some degree of technician error and you could have a higher reading the second time. A cervical length less than 1.5 cm during the second trimester is associated with preterm birth. In such cases, woman are limited to strict bed rest.