4.1 Main findings
Based on a large data set of ultrasonographic biometric measurements, we
are the first to develop fetal ultrasound biometric standards,
including EFW, BPD, HC, AC, FL and
HL, among Chinese uncomplicated twin pregnancies. The major strength of
this study lies in taking both chorionicity and mode of conception into
account, and the findings showed that SC-DCDA twins had faster growth
rate than SC-MCDA twins, while slower than ART-DCDA twins. When making
comparison with data from singletons, all of the three shows slower
growth pattern, however, the contrasts were mainly observed during the
third trimester. The data enriched our understanding on the
twin-specific fetal growth trajectories, and the standards established
in this study have potential to promote more accurate assessment of
intrauterine growth trajectory for
Chinese twins.