Cervical length ultrasound in pregnancy
cervical length scan · cervical length measurement · cervix ultrasound in pregnancy · transvaginal cervical length
The doctor uses ultrasound to measure the length of your cervix during pregnancy. A short cervix can be a risk for early birth.
Usually in the second trimester, often together with the second screening. More often if you had an early birth before or are at risk.
⏱ Duration: usually 10 to 15 minutes; results right away
Be sure to tell your doctor
How to prepare
- Bladder. Usually an internal probe is used, so your bladder should be empty. Use the toilet before the scan.
- Safety. The scan is safe for the baby. No special prep is needed.
What to bring
- Your pregnancy record (prenatal card)
- Your referral
- Past ultrasound reports
How it goes
- You undress below the waist and lie on your back
- A cover with gel is put on the probe
- The probe is gently placed a short way into the vagina
- The doctor measures the cervix, sometimes several times
- Sometimes you are asked to cough or push a little. This checks the cervix under pressure
What you'll feel
- Light pressure, usually not painful
- Feeling nervous is normal. Tell the doctor if it is uncomfortable
Afterwards
- You can go back to your usual day right away
- Results right away
- If your cervix is short, the doctor will discuss ways to support the pregnancy
Contact a doctor straight away if
- Contractions, bleeding from the vagina, or your water breaking: call emergency services right away
Common questions
Can an internal probe harm the baby?
No. The probe stays near the cervix and does not touch the baby. It is the standard method.
What if my cervix is short?
It does not mean labor will start. There are ways to support the pregnancy. Your doctor will choose one.