• Suzanne van Rijswijk, Mariëtte J C Nagtegaal, Steward McGavin, and Gus Dekker.
• Department of Obstetrics and Gynaecology, Lyell McEwin Hospital, University of Adelaide, South Australia, Australia.
• Aust N Z J Obstet Gynaecol. 2005 Oct 1; 45 (5): 418-23.

ObjectiveTo evaluate the impact of cervical length (CL) measurements in pregnant women at risk for preterm delivery on intervention and pregnancy outcome.DesignRetrospective study.SettingRegional high-level II maternity unit.MethodsHospital databases were reviewed for all women delivering between March 2001 and March 2003. Women at an increased risk for preterm birth with transvaginal (TV) cervical length measurements during pregnancy were included in this audit. Patients (n = 204) were analysed together and in subgroups with different risk profiles.ResultsFor women with a significant obstetrical history, most of the cervical lengths ConclusionsFor patients with a high-risk obstetrical history, a first cervical length measurement at the time of foetal morphology scan followed by one measurement at about 24 weeks would result in a timely diagnosis of almost all cases of clinically relevant cervical shortening. Just having a twin pregnancy, in the absence of other risk factors for preterm birth, does not require cervical length monitoring. Having a twin pregnancy plus additional risk factors clearly identifies a group requiring cervical length measurement and intervention. Previous LLETZ procedures or >or= 3 preceding curettages were not found to be a major risk factor for preterm birth.

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