Measurement of amniotic fluid volume: accuracy of ultrasonography techniques.
Publication/Presentation Date
12-1-1992
Abstract
OBJECTIVE: Our purpose was to determine amniotic fluid volume by the dye-dilution technique and compare it with the amniotic fluid index, largest vertical pocket, and two-diameter pocket (defined as vertical x horizontal of the largest vertical pocket).
STUDY DESIGN: This prospective study involved 40 women undergoing amniocentesis in late pregnancy to detect fetal lung maturity or evidence of chorioamnionitis. The amniotic fluid volume was quantified ultrasonographically by means of the amniotic fluid index, largest vertical pocket, and two-diameter pocket. During amniocentesis the fluid volume was calculated by the dye-dilution technique of Charles and Jacoby.
RESULTS: Ultrasonographic measurements by amniotic fluid index, largest vertical pocket, and two-diameter pocket correctly predicted normal amniotic fluid and hydramnios (74%). A new measurement, two-diameter pocket, gave a significantly more accurate estimate of oligohydramnios than did amniotic fluid index (p < 0.002) or largest vertical pocket (p < 0.0003).
CONCLUSION: All three indices are moderately accurate in identifying normal amniotic fluid volume and hydramnios. Two-diameter pocket is the most accurate test to predict oligohydramnios.
Volume
167
Issue
6
First Page
1533
Last Page
1537
ISSN
0002-9378
Published In/Presented At
Magann, E. F., Nolan, T. E., Hess, L. W., Martin, R. W., Whitworth, N. S., & Morrison, J. C. (1992). Measurement of amniotic fluid volume: accuracy of ultrasonography techniques. American journal of obstetrics and gynecology, 167(6), 1533–1537. https://doi.org/10.1016/0002-9378(92)91734-r
Disciplines
Medicine and Health Sciences
PubMedID
1471660
Department(s)
Department of Obstetrics and Gynecology
Document Type
Article