How long is the cervical canal?

In general, when the length of the cervical canal is less than 2.5 cm, it may be close to labor, but this is not an absolute criterion.

During pregnancy, the length of the cervical canal changes gradually. Before labor, the cervical canal will gradually shorten and flatten. If the length of the cervical canal is less than 2.5 cm, it may be close to labor. However, there are differences between individuals. Some pregnant women may enter labor at a shorter cervical canal, while others may not. In addition to cervical canal length, labor is also affected by a combination of factors such as uterine contraction intensity, fetal position, pelvic condition, etc. The length of the cervical canal is not the only factor that determines the exact time of delivery. The doctor will evaluate the symptoms, signs, and results of the prenatal examination, rather than focusing on the length of the cervical canal. For example, when a pregnant woman has regular contractions, redness, and water breaks, even if the length of the cervical canal is not very short, she may be about to give birth.