Reference range for amniotic fluid index measurements in a Brazilian population

Edward Araujo Júnior; Wellington P. Martins; David Baptista Silva Pares; Claudio Rodrigues Pires; Sebastião Marques Zanforlin Filho

doi:10.1515/jpm-2013-0293

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Reference range for amniotic fluid index measurements in a Brazilian population

Edward Araujo Júnior , Wellington P. Martins , David Baptista Silva Pares , Claudio Rodrigues Pires und Sebastião Marques Zanforlin Filho

Veröffentlicht/Copyright: 16. Januar 2014

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Aus der Zeitschrift Journal of Perinatal Medicine Band 42 Heft 4

Abstract

Objective: The aim of this study was to determine the reference range for amniotic fluid index (AFI) measurements in a large sample of the Brazilian population.

Methods: This was a retrospective cross-sectional study on 3837 normal singleton pregnancies between 18+0 and 38+6 weeks of pregnancy. The AFI was measured from the largest vertical pockets of amniotic fluid in the four quadrants of the uterine cavity. To assess the correlation between AFI and gestational age (GA), polynomial equations were calculated, with adjustments using the determination coefficient (R²).

Results: The mean maternal age and gestational age were 27.01±6.57 years and 30.43±5.29 weeks, respectively. The mean AFI ranged from 12.2±2.6 cm at 18 weeks to 11.6±6.0 cm at 38 weeks of pregnancy. The correlation between AFI and GA was best represented by a linear equation: AFI=17.78–0.153*GA (R²=0.027).

Conclusion: We established the reference range for the AFI in a large sample of the Brazilian population. This reference range can be used to monitor deviations in the volume of amniotic fluid in fetuses at high risk for intrauterine growth disturbances.

Keywords: Amniotic fluid index; Brazilian population; reference range

Corresponding author: Prof. Edward Araujo Júnior, PhD, Referral Center for Teaching of Diagnostic Imaging (CETRUS), Rua Carlos Weber, 956, apto. 113 Visage, Alto da Lapa, São Paulo-SP, CEP 05303-000, Brazil, Tel.: +55 11 37965944, Fax: +55 11 37965944, E-mail: araujojred@terra.com.br

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

Received: 2013-10-28

Accepted: 2013-11-25

Published Online: 2014-1-16

Published in Print: 2014-7-1

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Artikel in diesem Heft

https://doi.org/10.1515/jpm-2013-0293

Schlagwörter für diesen Artikel

Amniotic fluid index; Brazilian population; reference range