Accessible Unlicensed Requires Authentication Published by De Gruyter October 23, 2015

Reference values for the single deepest vertical pocket to assess the amniotic fluid volume in the second and third trimesters of pregnancy

Alberto Borges Peixoto, Taciana Mara Rodrigues da Cunha Caldas, Camila Vieira Giannecchini, Liliam Cristine Rolo, Wellington P. Martins and Edward Araujo Júnior

Abstract

Aim:

To establish reference values for the single deepest vertical pocket to assess the amniotic fluid volume in the second and third trimesters of pregnancy.

Methods:

We performed a retrospective cross-sectional study with 3554 consecutive singleton low-risk pregnant women between 14 and 41 weeks of gestation. To perform the largest deepest vertical pocket measurement, the transabdominal convex probe was positioned vertical to the uterine contour of abdomen and parallel to the maternal sagittal plane. In order to obtain reference values for the largest deepest vertical pocket measurement and gestational age (GA), we have used a polynomial regression model.

Results:

The mean±standard deviation for the largest deepest vertical pocket measurement (cm) ranged from 3.1±1.1 (1.5–4.9) at 14–14+6 to 3.7±1.6 (0–6.7) at 41–41+6 weeks, respectively. A best-fit was a second-degree polynomial regression: largest deepest pocket=–1.478+0.197*GA–0.0030*GA2 (R2=0.014).

Conclusion:

Reference values for the single deepest vertical pocket to assess the amniotic fluid volume in the second and third trimesters of pregnancy in a large heterogeneous population were established.


Corresponding author: Prof. Edward Araujo Júnior, PhD, Rua Belchior de Azevedo, 156 apto. 111 Torre Vitoria, São Paulo–SP, Brazil, CEP 05089-030, Tel./Fax: +55-11-37965944, E-mail: ; and Department of Obstetrics, Paulista School of Medicine - Federal University of São Paulo (EPM-UNIFESP), São Paulo-SP, Brazil

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The authors stated that there are no conflicts of interest regarding the publication of this article.

Received: 2015-7-31
Accepted: 2015-9-29
Published Online: 2015-10-23
Published in Print: 2016-8-1

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