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From that point, pressure from the presenting part (head in vertex births or bottom in breech births), along with uterine contractions, will dilate the cervix to 10 centimeters, which is "complete." Cervical dilation is accompanied by effacement, the thinning of the cervix. General guidelines for cervical dilation: Latent phase: 0–3 centimeters
The latent phase is defined by cervical dilation of 0 to 6 cm. The active phase is defined by cervical dilation of 6 cm to 10 cm. Second stage of labor starts when the cervix is dilated to 10 cm and finishes with the birth of the baby. This stage is characterized by strong contractions and active pushing by the mother.
1–2 cm 3–4 cm 5+cm Dilation is a measure of how open the cervical os is. It is usually the most important indicator of progression through the first stage of labour. Dilation is measured by way of a digital cervical exam with the care providers fingers. Dilation is described using centimetres; closed, 1cm, 2cm, 3cm, etc until fully dilated ...
Along with other factors, midwives and doctors use the extent of cervical dilation to assist decision making during childbirth. [34] [35] Generally, the active first stage of labour, when the uterine contractions become strong and regular, [34] begins when the cervical dilation is more than 3–5 cm (1.2–2.0 in).
Some of these efforts are: emphasizing a long latent phase of labor is not abnormal and not a justification for C-section; a new definition of the start of active labor from a cervical dilatation of 4 cm to a dilatation of 6 cm; and allowing women who have previously given birth to push for at least 2 hours, with 3 hours of pushing for women ...
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In the US, the definition of active labour was changed from 3 to 4 cm, to 5 cm of cervical dilation for mothers who had given birth previously, and at 6 cm for those who had not given birth before. [55] This was done in an effort to increase the rates of vaginal delivery. [56]
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