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  • Unconditional reference values for the amniotic fluid index measurement between 26w0d and 41w6d of gestation in low-risk pregnancies

    Author(s)
    Peixoto, Alberto Borges
    Rodrigues da Cunha Caldas, Taciana Mara
    Martins, Wellington P
    Costa, Fabricio Da Silva
    Araujo Junior, Edward
    Griffith University Author(s)
    Da Silva Costa, Fabricio
    Year published
    2016
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    Abstract
    Objective: To establish reference values for the amniotic fluid index (AFI) measurement between 26w0d and 41w6d of gestation in a Brazilian population. Methods: We performed a cross-sectional study with 1984 low-risk singleton pregnant women between 26w0d and 41w6d of gestation. AFI was measured according to the technique proposed by Phelan et al. Maternal abdomen was divided into four quadrants using the umbilicus and linea nigra as landmarks. Single vertical pocket in each quadrant was measured and the AFI was generated by the sum of these four values without umbilical cord or fetal parts. All ultrasound exams were performed ...
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    Objective: To establish reference values for the amniotic fluid index (AFI) measurement between 26w0d and 41w6d of gestation in a Brazilian population. Methods: We performed a cross-sectional study with 1984 low-risk singleton pregnant women between 26w0d and 41w6d of gestation. AFI was measured according to the technique proposed by Phelan et al. Maternal abdomen was divided into four quadrants using the umbilicus and linea nigra as landmarks. Single vertical pocket in each quadrant was measured and the AFI was generated by the sum of these four values without umbilical cord or fetal parts. All ultrasound exams were performed by only two experienced examiners. AFI was expressed as median, interquartile range, mean and ranges in each gestational age (GA) interval. Polynomial regressions were performed to obtain the best fit with adjustment by the determination coefficient (R2). Results: Mean of AFI ranged from 14.0 ± 4.1 cm (range, 9.7–14.0) at 26w0d to 8.3 ± 4.7 cm (range, 1.9–16.5) at 41w6d, respectively. The best polynomial regression fit curve was a first-degree: AFI = 16.29–0.125*GA (R2 = 0.01). According the scatterplot, AFI values practically did not vary with advancing GA. Conclusion: Reference values for the AFI measurement between 26w0d and 41w6d of gestation in a low-risk Brazilian population were established.
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    Journal Title
    The Journal of Maternal-Fetal & Neonatal Medicine
    Volume
    29
    Issue
    20
    DOI
    https://doi.org/10.3109/14767058.2015.1123246
    Subject
    Reproductive medicine
    Science & Technology
    Life Sciences & Biomedicine
    Obstetrics & Gynecology
    Amniotic fluid volume
    low-risk population
    Publication URI
    http://hdl.handle.net/10072/413928
    Collection
    • Journal articles

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