estimated fetal weight discordance
Pronunciation: dis-KOR-dans
Significant difference in estimated weights between twins, typically defined as greater than 20% difference.
Full Definition
Estimated fetal weight discordance refers to a substantial difference in the estimated weights of twins, usually calculated as a percentage difference where the larger twin's weight minus the smaller twin's weight is divided by the larger twin's weight. Discordance of 20% or greater is considered significant and may indicate selective intrauterine growth restriction or twin-to-twin transfusion syndrome. This measurement guides monitoring frequency, delivery timing, and neonatal care planning in multiple gestations.
Usage
Usage note: Threshold for significance varies but commonly set at 20%; requires careful monitoring in twin pregnancies.
In Context
- "The 25% estimated fetal weight discordance prompted weekly ultrasound monitoring for twin-to-twin transfusion syndrome." — Twin pregnancy surveillance plan
- "Serial ultrasounds showed progressive EFW discordance from 15% to 30% over four weeks." — Multiple gestation monitoring report