Umbilical Cord Coiling and Zygosity: Is there a Link?

INTRODUCTION: The aim of this study was to analyze abnormalities of umbilical coiling index (UCI) in twin gestation to test whether the coiling is genetically influenced by zygosity. METHODS: Data retrieved comprised gestational age (GA), chorionicity, fetal gender, and UCI. RESULTS: The mean UCI of hypercoiled cords in monochorionic placentas was 0.55 coils/cm and 0.49 coils/cm in dichorionic placentas with discordant fetal gender (P = 0.2629). DISCUSSION: In conclusion, no significant statistical difference between UCI in monochorionic and dichorionic twin placentas with discordant fetal gender was identified, suggesting that zygosity does not play a role in umbilical coiling induction.