The cervical canal at 16 weeks of pregnancy is about 3 to 4 centimeters, varying from individual to individual but generally greater than 3 centimeters.
The cervical canal is the cavity between the uterus and the opening of the cervix, which can be observed through vaginal examination, probe examination, etc. The general length of the cervix is 3 to 4 centimeters, some of which may vary due to the size of the individual but is generally greater than 3 centimeters.
Generally, the length of the cervical canal does not change until 37 weeks, when after 37 weeks, the cervical canal will gradually shorten until the mouth of the uterus opens for delivery. If the length of the cervical canal is found to be less than 2.5 centimeters on examination before 37 weeks, it suggests that there may be a risk of preterm labor.