2.2 Fetal and maternal parameters
The follow-up data of fetuses with d-TGA were retrospectively retrieved from our hospital’s electronic data system. All fetuses diagnosed with d-TGA were examined every two weeks until birth. During every ultrasonographic examination, the estimated birth weight, fetal biometry and amniotic fluid index were estimated, and umbilical artery Doppler measurements were made. Maternal age, gestational age at birth, mode of delivery, and birth weight were also recorded. Prenatal genetic testing for aneuploidies and 22q11 microdeletion was offered to all families.