Membrane Sweeps: What They Actually Do

If you're getting close to your due date, someone might mention doing a membrane sweep, sometimes called a stretch and sweep.

And if you're wondering whether it hurts, whether it actually works or what on earth they're sweeping, you're definitely not alone!

I've had membrane sweeps myself, and I remember gripping the bed and Brendan's hand because they were so uncomfortable.

So here's what I wish every mother knew before agreeing to one.

What exactly is a membrane sweep?

A membrane sweep is a procedure that may help encourage labour to begin without medication.

During a vaginal examination, your midwife or doctor places a gloved finger through your cervix, if it's open enough, and gently moves it in a circular motion to separate the membranes around your baby from the lower part of your uterus.

This encourages the release of prostaglandins, hormones that help prepare your cervix for labour.

It's different from breaking your waters, and it's different from having medication to induce labour.

When might I be offered one?

You may be offered a membrane sweep as you approach or pass your due date, especially if you're hoping labour will start before a planned induction.

For example, NICE guidance recommends discussing the option after 39 weeks.

The timing varies depending on your pregnancy, your circumstances and where you're giving birth.

A sweep isn't suitable for everyone, so your maternity team should explain whether it's appropriate for you.

Does a membrane sweep hurt?

It certainly can!

Some mothers describe uncomfortable pressure, while others experience quite significant pain.

For me, they were definitely not pleasant. I remember holding on tightly and just wanting the examination to be over.

But not everyone experiences them the same way.

And something I really want you to know is that you can ask your midwife or doctor to stop at any point.

You don't have to push through pain simply because the procedure has started.

Does a membrane sweep actually work?

Sometimes!

Research suggests a membrane sweep can increase the chance of labour starting without a formal induction.

But it isn't a guarantee.

You might go into labour over the next day or two, or absolutely nothing might happen.

It also depends on how ready your cervix is and what's happening with your pregnancy.

If one sweep doesn't work, your maternity team might discuss another sweep or other options.

What should I expect afterwards?

You might notice some period-like cramping, irregular contractions, light spotting or mucus mixed with a little blood.

You may even notice part of your mucus plug coming away.

These can happen after a sweep and don't necessarily mean you're in established labour.

However, contact your maternity team promptly if you have significant or fresh bleeding, your waters break, your baby's movements change or you're concerned about anything you're experiencing.

Can I say no to a membrane sweep

Absolutely.

A membrane sweep is optional, and your consent matters.

You can ask what the benefits might be for your pregnancy, what happens if you wait and whether there are other options.

And agreeing to a cervical examination doesn't automatically mean you've agreed to a membrane sweep.

After four births, I've learned that having more information makes those decisions feel much easier.

A membrane sweep might be worth considering, but it's completely reasonable to decide it isn't for you.

Read next

• Cervical Checks: What They Can and Cannot Tell You

• Induction of Labour: What to Expect

• Going Overdue: What Happens After Your Due Date?