My Pregnancy

Cervical length measurement

Cervical length measurement

Women at high risk 

Consult by Preterm prevention specialist by 12 weeks where possible, or with the dating scan whichever is sooner, and transvaginal cervix scanning as a secondary screening test every 2–4 weeks between 16 and 24 weeks.

1- Those with a previous preterm birth or second trimester loss (16–34 weeks’ gestation)

2- Previous preterm prelabour rupture of membranes (PPROM) less than 34 weeks

3- Previous use of cerclage

4- Known uterine variant

5- Intrauterine adhesions

6- History of trachelectomy.

Management

– If cervical length 25mm or less, cerclage may be considered. 

Women at intermediate risk 

Single transvaginal cervix scan should be done in following women. Timing of which is dependent on the women’s history, however no later than 18–22 weeks.

1- Women including those who have a history of a previous full dilatation C-section

2- Significant cervical excisional surgery i.e. large loop excision of the transformation zone (LLETZ) with an excision depth greater than 1 cm, more than one procedure or a cone biopsy.

Management

– If cervical length 25mm or less, cerclage may be considered.