Cervical length and dilatation of the internal cervical os detected by vaginal ultrasonography as markers for preterm delivery: A systematic review
Abstract
Objective We performed a systematic review to evaluate endovaginal cervical ultrasonography as a predictor of preterm delivery.Study design Selection criteria were original published English-language reports of prospective studies including women at <37 weeks' gestation with intact amniotic membranes. Parameters and outcomes were cervical length or dilatation of the internal cervical os and preterm delivery.Results In 3 subgroups of studies including patients with preterm labor or low-risk, symptom-free patients with early (20-24 weeks) or late (27-32 weeks) ultrasonographic examination, optimal cutoff values for cervical lengths ranged between 18 and 30, 25 and 35, or 25 and 39 mm. At these cutoff values, sensitivity rates were between 68% and 100%, 33% and 54%, or 63% and 76%, and specificity rates were between 44% and 79%, 73% and 91%, or 59% and 69%, respectively. Sensitivity rates for dilatation of the internal cervical os were 70% to 100%, 16% to 25%, or 33%, and specificity rates were 54% to 75%, 95% to 99%, or 92%, respectively.Conclusion In patients with symptoms of preterm labor, endovaginal cervical ultrasonography appears to be an effective predictor of preterm delivery.
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With a cervical length greater than 30 mm, the likelihood of delivering in the next week is about 1%, and most women can be safely discharged without treatment.
“With a cervical length greater than 30 mm, the likelihood of delivering in the next week is about 1%, and most women can be safely discharged without treatment.124”
From Epidemiology and causes of preterm birth (2008) · cites this paper as [124]
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- Authors
- Leitich, H., Brunbauer, M., Kaider, A., Egarter, C., & Husslein, P.
- Affiliations
- University of Vienna (AT)
- ORCID
- Leitich, Harald
- Venue
- American Journal of Obstetrics and Gynecology
- Publisher
- Elsevier BV
- Published
- 1999-12
- Volume
- 181
- Issue
- 6
- Pages
- 1465-1472
- ISSN
- 0002-9378 (ISSN-L)
- OpenAlex
- W2032392964
- Cited by
- 178
- References
- 35
- Citations by year
- 2025: 2 · 2024: 2 · 2023: 4 · 2022: 5 · 2021: 5 · 2020: 7 · 2019: 6 · 2018: 8 · 2017: 8 · 2016: 8 · 2015: 6 · 2014: 5 · 2013: 8 · 2012: 7
- FWCI
- 0.94
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- American Journal of Obstetrics and Gynecology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Preterm Birth and Chorioamnionitis
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Infant Development and Preterm Care
- Keywords
- cervical length, preterm birth prediction, preterm labor, cut-off values, sensitivity and specificity, low-risk pregnancy
- MeSH terms
- Cervix Uteri, Female, Humans, Obstetric Labor, Premature, Predictive Value of Tests, Pregnancy, Prospective Studies, Sensitivity and Specificity, Ultrasonography, Prenatal
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