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We counted nucleated red blood cells (NRBC) per 100 white blood cells (WBC) in the umbilical cord blood from 98 twins born to 49 women with uncomplicated twin pregnancies at ≥ 34 weeks of gestation to better characterize NRBC in twins. Twelve women with monochorionic (MC) placentas and 37 with dichorionic (DC) placentas gave birth at 36.7 ± .9 and 36.5 ± 2 weeks of gestation, respectively. All twins were born with an Apgar score of ≥ 7 at 1 min. Log 10 (NRBC/100 BC) in 98 twins exhibited a nearly normal distribution, and was significantly associated with gestational age for both MC (r=−0.457, p = 0.025) and DC twins (r =−0.275, p = 0.018), and with birth weight for both MC (r=−0.682, p < 0.001) and DC twins (r=−0.336, p = 0.003). Log 10 (NRBC/100 WBC) tended to be larger in smaller twins than in larger twins in the MC group, and significantly larger in smaller twins than in larger twins in the DC group (p < 0.05). Intertwin difference in Log 10 (NRBC/100 WBC) was defined as the value of Log 10 (NRBC/100 WBC) of the smaller twin minus Log 10 (NRBC/100 WBC) of the larger twin, and became greater with increasing intertwin difference in birth weight (r = 0.411, p = 0.003). These findings suggest that neonatal NRBC reflected gestational age and birth weight in twins. This preliminary observation using a small number of twins suggests that the smaller twin may have experienced a relative lack of oxygen compared with the larger twin in utero.
Journal of Perinatal Medicine – de Gruyter
Published: Apr 5, 2001
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