Repeated cervical length measurements for the verification of short cervical length

Frederik J.R. Hermans*, Bouchra Koullali, Melanie A. van Os, Jeanine E.M. van der Ven, Brenda M. Kazemier, Mallory D. Woiski, Christine Willekes, Petra N. Kuiper, Frans J.M.E. Roumen, Christianne M. de Groot, Esteriek de Miranda, Corine Verhoeven, Monique C. Haak, Eva Pajkrt, Ewoud Schuit, Ben Willem J. Mol

*Corresponding author for this work

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Objective: To determine if the verification of short cervical length with a repeated measurement improved the identification of patients with short cervical length at increased risk of preterm delivery. Methods: The present secondary analysis analyzed prospective cohort study data from patients with singleton pregnancies without a history of preterm delivery who presented for obstetric care in the Netherlands and delivered between November 18, 2009, and January 1, 2013. Cervical length was measured during standard anomaly scan and a second measurement was performed if the cervical length was 30 mm of shorter. Logistic regression and Cox proportional hazards modeling were used to evaluate associations between cervical length measurements and spontaneous preterm delivery before 37 weeks of pregnancy. Results: Cervical length measurements from 12 358 patients were included; 221 (1.8%) had an initial cervical length measurement of 30 mm or shorter. A second cervical length measurement was performed for 167 (75.6%) patients; no differences were identified in the odds of spontaneous preterm delivery when evaluated using the first, second, or a mean of both measurements, regardless of whether cervical length was analyzed as a continuous or dichotomous variable. Conclusion: Among patients with singleton pregnancies, verification of short cervical length did not improve the identification of short cervical length.

Original languageEnglish
Pages (from-to)318-323
Number of pages6
JournalInternational Journal of Gynecology and Obstetrics
Issue number3
Publication statusPublished - 1 Jan 2017

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