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This is a transvaginal scan to measure the length of the cervix. It is recommended in women at high risk for preterm birth, including multiple pregnancies, those with a previous preterm birth, abnormalities of the uterus or previous cervical surgery. It is usually carried out during anomaly scan but in women with previous preterm birth a series of scans are done starting from 16 weeks.

What does a cervical length scan involve?

During a cervical length scan, your cervix will be assessed for early opening, as this can increase your risk of infection and preterm delivery. If doctor identifies any risks, she will monitor your pregnancy very carefully.