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Comparison of Transabdominal and Transvaginal Ultrasonography for the Assessment of Cervical Length in Third

Javeria Khan1,2, Muqadas Qureshi1, Arif Rasheed3

  • 1Deprtment of Radiography and Imaging Technology, Green International University, 54770, Lahore, Pakistan.

The British Journal of Radiology
|August 4, 2025
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Summary

Transvaginal ultrasound (TVS) and transabdominal ultrasound (TAS) both assess cervical length in the third trimester. TVS offers more accurate measurements, crucial for reducing preterm birth risks.

Keywords:
cervical lengthtransabdominal ultrasoundtransvaginal ultrasound

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Area of Science:

  • Obstetrics and Gynecology
  • Medical Imaging
  • Perinatology

Background:

  • Cervical length assessment in the third trimester is vital for predicting preterm birth.
  • Transabdominal ultrasound (TAS) and transvaginal ultrasound (TVS) are common imaging modalities.

Purpose of the Study:

  • To compare the accuracy and reliability of TAS and TVS for measuring cervical length in the third trimester.
  • To determine the optimal ultrasound method for precise cervical length monitoring.

Main Methods:

  • A cross-sectional analytical study involving 223 pregnant women (18-45 years) between 26-30 weeks gestation.
  • Paired transabdominal and transvaginal ultrasound measurements of cervical length were obtained.
  • Clinical and demographic data were collected, including gestational age and risk factors.

Main Results:

  • Mean transvaginal ultrasound cervical length (CL) was 35.2 ± 6.8 mm; mean transabdominal ultrasound CL was 34.7 ± 6.5 mm.
  • Significant differences were observed between the mean CL measurements from TAS and TVS (P < 0.05).
  • Paired measurements were successfully obtained in 51.3% of participants.

Conclusions:

  • Both TAS and TVS are valuable for cervical length assessment.
  • Transvaginal ultrasound is recommended as the gold standard for accurate and reliable cervical length measurements.
  • This comparison aids in optimizing methods to reduce preterm birth risks.