Facing a twin pregnancy? Understanding the risks of preterm birth is crucial, and a new study sheds light on early detection methods. This research suggests that measuring cervical length (CL) in the first trimester could be a valuable tool.
The Big Picture:
In twin pregnancies, the risk of delivering prematurely—before 34 weeks of gestation—is a significant concern. This study explores whether assessing cervical length early on can help predict this risk. The study found that CL measurements below certain thresholds might warrant closer monitoring. However, a history of preterm birth remains the most significant predictor.
How the Study Worked:
Researchers conducted a retrospective, multicenter study in Poland from 2015 to 2023. They aimed to determine if first-trimester CL measurements could independently predict spontaneous preterm birth before 34 weeks in twin pregnancies.
- They analyzed data from 2004 women with twin pregnancies. These women had scans at 11-13 weeks of gestation.
- The pregnancies were categorized based on delivery timing: those delivering between 24 + 0 and 33 + 6 weeks, and those delivering after 34 weeks.
- Cervical length was measured using transvaginal ultrasonography, following established guidelines. Cutoff points of 30 mm and 35 mm were evaluated.
Key Findings:
- Spontaneous preterm birth before 34 weeks occurred in 11.3% of the twin pregnancies (226 cases).
- Women who delivered early (between 24 + 0 and 33 + 6 weeks) were more likely to have CL measurements below 35 mm (49.6% vs. 22.3%) and below 30 mm (16.4% vs. 3.9%) in the first trimester. The statistical significance for both was P < .001.
- CL measurements below 35 mm and 30 mm were associated with approximately 3.4-fold and 4.9-fold higher odds of spontaneous preterm birth, respectively (P < .05 for both).
- Maternal risk factors, such as a history of preterm birth and diabetes (type 1 or 2), significantly increased the odds of preterm birth—by approximately 19-fold and 3.5-fold, respectively (P < .05 for both).
- And this is the part most people miss... After adjusting for other factors, a history of preterm birth remained the only independent predictor.
In Practice:
The authors noted that assessing CL in the first trimester helps identify twin pregnancies that require close monitoring.
The Source:
The study was led by Magdalena Litwińska from the Medical University of Warsaw and published in BMC Pregnancy and Childbirth on December 12, 2025.
Important Considerations:
- The study was retrospective, meaning it looked back at existing data.
- Data on maternal characteristics was incomplete.
- Variability between different examiners wasn't assessed, even though measurements were taken at five different centers.
- CL measurements were performed within a 2-week window and not adjusted for gestational age.
Controversy & Comment Hooks:
Does this mean early CL measurement should be a standard practice for all twin pregnancies? While the study highlights the potential of CL measurement, it's essential to consider its limitations and the dominant role of a mother's history of preterm birth. What are your thoughts? Share your opinions in the comments below!
