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Cervical scan
This scan is performed transvaginally to assess the competence of the cervix and the chance of going into premature labour.
The bladder is best emptied prior to the scan.
A thin probe is passed through the vagina and the cervix is visualised and measured. Opening of the internal cervical entry of the canal (funnelling) and shortening of the cervix are associated with increased risk of preterm labour. A cervical length of less than 1.5cm is associated with an increased risk of prematurity.
This scan is performed from 12 weeks onwards and up to 34 weeks. Some patients may need to have regular scans (every 2-4 weeks) throughout the pregnancy.
The scan is perfectly safe and does no damage to the fetus or yourself.
Common indications for the scan:
- Previous mid-pregnancy loss
- Previous premature labour
- Threatened premature labour in the current pregnancy
- Cervical surgery (such as big loop excisions, laser cone).
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