Understanding Labour Effacement: What You Need to Know

In this blog post, I share some basic understanding of the physiological process of labour effacement. I'll also share its significance - and it's insignificance - when it comes to the overall childbirth process.

What is Labour Effacement?

Labour effacement, also known as cervical effacement refers to the thinning and shortening of the cervix in preparation for delivery.

During pregnancy, the cervix acts as a barrier between the uterus and the birth canal. During labour, it needs to efface in order to make space for baby to pass through. Effacement is often measured as a percentage, with 0% indicating a thick and long cervix, and 100% indicating complete effacement or a paper thin cervix.

The Significance (and insignificance) of Labour Effacement:

1. Progress of labour: Effacement is one of the three main measurements used by care providers to assess the progress of labour, alongside dilation (opening of the cervix) and station (position of baby's head in relation to the pelvis). It's a good indicator of how the cervix is changing and preparing for delivery. As labour progresses, the cervix gradually thins and shortens, making way for the baby's descent through the birth canal.

2. Predicting delivery timeline: Labour effacement, along with dilation, can provide an estimate of the timeframe until delivery. However, it's important to note that every woman's labour is unique, and the rate of effacement can vary significantly.

3. Readiness for interventions: Most hospital protocols use cervical effacement to help determine when interventions, such as augmentation of labour, may be appropriate. If the cervix is not yet sufficiently effaced or dilated within a set timeframe, care providers may offer alternative options for parents to consider.

   It’s important to remember that these are purely recommendations, and you have the right to decline any interventions (or ask for more time) if they don’t feel right.

4. Relation to dilation: While effacement refers to the thinning and shortening of the cervix, dilation refers to the opening or widening of the cervix. The two processes often occur simultaneously during labour, but it is possible for effacement to happen before significant dilation occurs. Dilation is usually measured in centimetres and represents how much the cervix has opened to allow the baby to pass through.

Monitoring Labour Effacement:

During labour, your midwife will offer to assess your cervical effacement by performing a vaginal examination. They use their fingers to feel and measure the thickness of the cervix.

Although internal examinations are routinely offered within maternity care, it's important to remember that this is your choice. Verbal consent should always be obtained, and you can decline.

What You Also Need to Know:

1. Vaginal examinations can slow down or reverse the progress made so far, as it can inhibit the release of Oxytocin.

2. Monitoring labour effacement through vaginal examinations only tells you how far you are at that moment. It doesn’t indicate how fast labour will progress. It's only a snapshot in time.

3. Vaginal examinations increase the risk of infections.

4. Measuring progress in percentages and centimetres can affect the birthing person’s mindset and their ability to surrender and trust their body and the physiological process - this, in itself, can lead to longer labour and increase the risk of unnecessary interventions.

5. There may be particular circumstances when the information gained is necessary to make a clinical assessment, or for medical professionals to provide appropriate care and support but this is not the case for all births.

If you’d like to learn more about birth physiology and how to prepare for a calm and empowering birth experience, you’re very welcome to join one of my Hypnobirthing courses in Bristol or online.

Photo by Lindsey Eden Photography