Cervical canal 2.5 cm at 24 weeks of pregnancy is not normal.
Normal cervical canal length at 24 weeks of pregnancy should be 3-5 centimeters as detected by ultrasound. If the cervical canal length is less than 3 centimeters, there is a risk of cervical insufficiency, especially if the cervical canal length is less than 2.5 centimeters, which is more likely to occur and lead to preterm labor or preterm miscarriage.
This shortening of the cervical canal is associated with a history of previous abortions, cervical surgery, and previous births. If there are symptoms of preterm labor or miscarriage during previous pregnancies, one should be alerted to cervical insufficiency caused by a shortened cervical canal and undergo early cervical cerclage to alleviate the risk of preterm labor or miscarriage caused by a shortened cervical canal, and then remove the cerclage after the full term of the pregnancy and wait for the birth of the baby.