Intrapartum amniotic fluid index: A poor predictor of abnormal fetal size

Nancy W. Hendrix, Suneet P. Chauhan, Everett F. Magann, James N. Martin, John C. Morrison, Lawrence D Devoe

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objective: Using receiver-operating characteristic (ROC) curves, we tried to determine the diagnostic threshold of amniotic fluid index (AFI) that will identify abnormal fetal size (birth weights under 2500 g or at least 4000 g) at 37 weeks or beyond. Methods: We analyzed prospectively over 2 years all parturients with intact membranes and known AFI in early labor. Patients with the following conditions were excluded: pregestational or gestational diabetes, known anomalies, and preterm labor. Two ROC curves were constructed, and the areas (± standard error of the mean [SE]) under the curves were calculated. P < .05 was considered significant. Results: Of the 1038 subjects meeting study criteria, 3.6% and 11.5% gave birth to infants who were small for gestational age (SGA) or macrosomic, respectively. Overall, 28.7% had oligohydramnios (AFI at most 5.0 cm) and 3.6% had hydramnios (AFI at least 24.0 cm). Small for gestational age was more common in patients with AFI at most 5.0 cm (6.4%) than in those with adequate fluid (AFI 5.1-23.9; 2.5%), or hydramnios (2.7%; P = .012). Macrosomic newborns were less likely to be born to women with oligohydramnios (7.7%) than to those with adequate amniotic fluid (13.1%) or hydramnios (13.5%). Areas under ROC curves are not significantly different from the area under the nondiagnostic line, indicating that AFI (0-34 cm) cannot differentiate between newborns under 2500 g and at or over 2500 g or under 4000 and at or more 4000 g. Conclusion: Intraparterium AFI appears to be a poor screening test to identify risk for delivery of SGA or macrosomic fetus.

Original languageEnglish (US)
Pages (from-to)823-827
Number of pages5
JournalObstetrics and Gynecology
Volume92
Issue number5
DOIs
StatePublished - Nov 1 1998

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Amniotic Fluid
Polyhydramnios
ROC Curve
Oligohydramnios
Gestational Age
Parturition
Newborn Infant
Gestational Diabetes
Premature Obstetric Labor
Birth Weight
Fetus
Membranes

ASJC Scopus subject areas

  • Obstetrics and Gynecology

Cite this

Hendrix, N. W., Chauhan, S. P., Magann, E. F., Martin, J. N., Morrison, J. C., & Devoe, L. D. (1998). Intrapartum amniotic fluid index: A poor predictor of abnormal fetal size. Obstetrics and Gynecology, 92(5), 823-827. https://doi.org/10.1016/S0029-7844(98)00249-X

Intrapartum amniotic fluid index : A poor predictor of abnormal fetal size. / Hendrix, Nancy W.; Chauhan, Suneet P.; Magann, Everett F.; Martin, James N.; Morrison, John C.; Devoe, Lawrence D.

In: Obstetrics and Gynecology, Vol. 92, No. 5, 01.11.1998, p. 823-827.

Research output: Contribution to journalArticle

Hendrix, NW, Chauhan, SP, Magann, EF, Martin, JN, Morrison, JC & Devoe, LD 1998, 'Intrapartum amniotic fluid index: A poor predictor of abnormal fetal size', Obstetrics and Gynecology, vol. 92, no. 5, pp. 823-827. https://doi.org/10.1016/S0029-7844(98)00249-X
Hendrix, Nancy W. ; Chauhan, Suneet P. ; Magann, Everett F. ; Martin, James N. ; Morrison, John C. ; Devoe, Lawrence D. / Intrapartum amniotic fluid index : A poor predictor of abnormal fetal size. In: Obstetrics and Gynecology. 1998 ; Vol. 92, No. 5. pp. 823-827.
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