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Amniotic fluid index and perinatal morbidity

D Dizon-Townson1, K A Kennedy, G A Dildy

  • 1Bess Kaiser Hospital, Portland, Oregon, USA.

American Journal of Perinatology
|May 1, 1996
PubMed
Summary

Assessing amniotic fluid index (AFI) alongside a reactive nonstress test (NST) improves detection of fetal risk for perinatal morbidity. An AFI of 7 cm or less warrants clinical concern for high-risk pregnancies.

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Area of Science:

  • Perinatal Medicine
  • Fetal Monitoring
  • Obstetrics

Background:

  • The nonstress test (NST) is a standard tool for fetal surveillance.
  • Identifying fetuses at risk for perinatal morbidity requires accurate assessment methods.

Purpose of the Study:

  • To evaluate if amniotic fluid index (AFI) assessment improves perinatal morbidity risk detection in high-risk pregnancies with a reactive NST.
  • To determine the optimal low AFI threshold for clinical concern.

Main Methods:

  • Retrospective comparison of the last NST and AFI within a week of delivery with perinatal morbidity indices.
  • Analysis of fetuses with reactive NSTs and varying AFI levels.

Main Results:

  • A decreasing AFI correlated with increased risk of a low 5-minute Apgar score and delivery for fetal distress in fetuses with a reactive NST.

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  • An AFI of 7 cm or greater showed a better inverse correlation with morbidity indices compared to lower cut-off values.

    • Conclusions:

    • Combining AFI assessment with NST enhances the prediction of perinatal morbidity compared to NST alone.
    • An AFI of 7 cm is a reasonable threshold for initiating clinical concern in high-risk pregnancies.