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The amniotic fluid index in normal twin pregnancies
L M Hill1, M Krohn, N Lazebnik
1Division of Ultrasound, Department of Obstetrics, Gynecology and Reproductive Sciences, Magee-Womens Hospital, Pittsburgh, Pennsylvania 15213, USA.
American Journal of Obstetrics and Gynecology
|April 14, 2000
Summary
The amniotic fluid index (AFI) in individual twin gestational sacs follows a similar pattern to singletons, rising and then declining. AFI values for twin A and twin B were comparable, with no significant difference from singleton pregnancies.
Area of Science:
- Perinatology
- Maternal-Fetal Medicine
- Obstetrics
Background:
- Assessing fetal well-being is crucial in twin pregnancies.
- The amniotic fluid index (AFI) is a key indicator of fetal health.
- Limited data exists on individual AFI in twin gestations.
Purpose of the Study:
- To investigate the AFI in individual gestational sacs of twin pregnancies.
- To compare AFI between twin A and twin B.
- To compare twin AFI with singleton pregnancies.
Main Methods:
- Prospective study of 488 diamniotic twin pregnancies.
- Amniotic fluid index measured in each sac from 14 to 40 weeks' gestation.
- Identification of the dividing membrane between fetuses.
Main Results:
- Median AFI in twin sacs increases from 14-16 weeks to 23-28 weeks, then declines.
- No statistically significant difference in AFI between twin A and twin B.
- Twin pregnancy AFI is comparable to singleton pregnancy AFI.
Conclusions:
- Individual AFI measurement is feasible in twin pregnancies.
- AFI trends in twins mirror those in singletons.
- AFI in twin gestations is not significantly different from singletons.