Obstet Gynecol Sci.  2016 Jul;59(4):303-306. 10.5468/ogs.2016.59.4.303.

Reference values for the cervical length measurement in the second trimester of pregnancy using the transvaginal ultrasound in a large Brazilian population

• Peixoto AB
• Cunha Caldas TMRd
• Alamy AH
• Martins WP
• Bruns RF
• Araujo Júnior E

• KMID: 2329051
• DOI: http://doi.org/10.5468/ogs.2016.59.4.303

Abstract

To establish reference values for the cervical length (CL) measurement by transvaginal ultrasound between 20 and 24+6 weeks of gestation in a large Brazilian population. A retrospective cross-sectional study was performed with 996 singleton pregnancies. The CL measurement (mm) using the transvaginal ultrasound was obtained in a sagittal view and the calipers positioned to measure the linear distance between the triangular area of echodensity at the external os and the internal os. The median±standard deviation and ranges for the CL measurement (mm) was 37.0±10.7 (range, 8 to 51). CL measurement did not modify significantly with gestational age. The observed percentiles for the CL measurement (mm) considering all number case were the following: 5th, 28 mm; 50th, 37 mm; and 95th, 45 mm. Reference values for the CL measurement by transvaginal ultrasound between 20 and 24+6 weeks of gestation in a large heterogeneous Brazilian population were established.

Keyword

Cervix uteri; Reference values; Second pregnancy trimester; Transvaginal ultrasound

MeSH Terms

Cervical Length Measurement*
Cervix Uteri
Cross-Sectional Studies
Female
Gestational Age
Humans
Pregnancy
Pregnancy Trimester, Second*
Pregnancy*
Reference Values*
Retrospective Studies
Ultrasonography*

Figure

• 

  Fig. 1 Transvaginal ultrasound examination showing the cervical length measurement at 22 weeks of gestation.

• 

  Fig. 2 Scatterplot for cervical length measurement (mm) as a function of gestational age (weeks).

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