917: Collective utility of NIPT zygosity determination and chorionicity assignment via ultrasound

BCG reaction in twin newborns: effect of zygosity and chorionicity.

OBJECTIVE To study local response to BCG vaccination in twin babies and find out the effect of zygosity andchorionicity on BCG uptake. DESIGN Analytical observational study. SETTING Tertiary hospital. METHODS Twin pairs born in the hospital were evaluated for zygosity and chorionicity. BCG vaccination was given within 48 hours of birth to babies >/=33 weeks of gestation and birth weight >...

Congenital malformations in twins: effect of chorionicity and zygosity.

We conducted this study to determine the pattern of congenital malformations in twins born in our hospital over a 9 month period (January to September 2006). Gross congenital anomalies were recorded within 6 hours of birth by detailed clinical examination in all successively delivered ≥23 weeks twin babies, whether stillborn or live-born. Radiological and autopsy examinations were carried out a...

Effects of chorionicity and zygosity on triplet birth weight.

Birth weight in triplets is, on average, lower than in singletons and twins, and more children are classified as having very low or extremely low birth weight. Still, there is limited research on factors that affect triplet birth weight, and samples under study are often small. Chorionicity and zygosity influence triplet birth weight, but it is unknown whether the effect of zygosity can be enti...

Effects of Chorionicity and Zygosity on Triplet Birth Weight

Does chorionicity or zygosity predict adverse perinatal outcomes in twins?

OBJECTIVE The purpose of this study was to evaluate chorionicity and zygosity as risk factors for adverse perinatal outcomes in twins. STUDY DESIGN A population-based, retrospective cohort study was conducted of all twin deliveries in Nova Scotia, Canada, from 1988 to 1997. Chorionicity was established by histologic examination. Zygosity was determined by chorionicity, sex, and infant blood g...