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Standards for the quantification of serial changes in the amniotic fluid index
Author(s) -
Owen P.,
Ogston S.
Publication year - 1996
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.1997.08060403.x
Subject(s) - medicine , amniotic fluid index , amniotic fluid , gestational age , ultrasound , obstetrics , index (typography) , fetus , obstetrics and gynaecology , pregnancy , radiology , genetics , world wide web , computer science , biology
A total of 274 low‐risk pregnancies underwent predetermined scheduled serial ultrasound examinations and measurements of the amniotic fluid index (AFI). As expected from previous cross‐sectional studies, there is a gradual decline in the AFI from mid‐trimester until term. The longitudinal nature of this data set permits the construction of conditional Gentiles for AFI whereby the AFI of an individual fetus at a given gestational age can be extrapolated to give a range of expected values for AFI (expressed as centiles) at a later gestational age. Examples of conditional centiles based upon 4‐week measurement separations are presented. These conditional centiles permit the appropriate evaluation and quantification of time‐dependent changes in AFI to be made. Copyright © 1996 International Society of Ultrasound in Obstetrics and Gynecology