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KMID : 0358420160590040303
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Korean Journal of Obstetrics and Gynecology
2016 Volume.59 No. 4 p.303 ~ p.306
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Reference values for the cervical length measurement in the second trimester of pregnancy using the transvaginal ultrasound in a large Brazilian population
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Alberto Borges Peixoto
Taciana Mara Rodrigues da Cunha Caldas
Ana Helena Bittencourt Alamy
Wellington P. Martins
Rafael Frederico Bruns
Edward Araujo Junior
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Abstract
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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.
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KEYWORD
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Cervix uteri, Reference values, Second pregnancy trimester, Transvaginal ultrasound
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