Objective: To study the association of different maternal and infant factors with the number of total nucleated cells and CD34+ hematopoietic stem/progenitor cells in umbilical cord blood, and to provide a reference for reasonable selection of umbilical cord blood in the cord blood bank.
Methods: A prospective study was performed for the umbilical cord blood samples of 130 neonates who were born in Dalian Women and Children's Medical Center from June 2019 to January 2020, with a male/female ratio of 1:1. Related perinatal information was collected, including maternal age and blood type, presence or absence of gestational diabetes or gestational hypertension, pregnancy method, mode of delivery, singleton pregnancy/twin pregnancy, body weight and sex of neonates, Apgar score after birth, and the conditions of placenta, amniotic fluid, and umbilical cord.
Results: The neonates were grouped according to maternal blood type, gestational diabetes, gestational hypertension, pregnancy method, mode of delivery, singleton pregnancy/ twin pregnancy, sex of neonates, Apgar score after birth, placental morphology, meconium staining of amniotic fluid, and umbilical cord around the neck. The comparison between groups showed no significant differences in the numbers of total nucleated cells and CD34+ cells in umbilical cord blood (P > 0.05). Maternal age and neonatal body weight were not correlated with the number of total nucleated cells in umbilical cord blood (P > 0.05), and neonatal body weight was not correlated with the number of CD34+ cells (P > 0.05), while maternal age was positively correlated with the number of CD34+ cells (P < 0.05).
Conclusions: The number of CD34+ cells in umbilical cord blood increases with the increase in maternal age, and therefore, umbilical cord blood in the cord blood bank may be selected based on maternal age.
目的: 比较不同母婴因素与脐血有核细胞总数及CD34+造血干/祖细胞数量的关系，为脐血库合理选择脐血提供参考。
方法: 前瞻性收集130例2019年6月至2020年1月期间于大连市妇女儿童医疗中心分娩的新生儿脐血标本，男女比例为1：1。收集围生期相关信息：孕母年龄及血型，有/无妊娠糖尿病、妊娠高血压，妊娠方式、分娩方式、单胎/双胎，新生儿体重、性别、生后Apgar评分，以及胎盘、羊水、脐带情况。
结果: 根据孕母血型、妊娠糖尿病、妊娠高血压、妊娠方式、分娩方式、单胎/双胎，新生儿性别、生后Apgar评分，胎盘形态、羊水胎粪污染、脐带绕颈等情况进行分组，组间比较脐血有核细胞总数及CD34+细胞计数差异均无统计学意义(P > 0.05)。孕母年龄、新生儿体重与脐血有核细胞总数无相关性(P > 0.05)，新生儿体重与CD34+细胞计数无相关性(P > 0.05)，孕母年龄与CD34+细胞计数呈正相关(P < 0.05)。
结论: 脐血中CD34+细胞数量随孕母年龄增大而增多，故脐血库在筛选脐血时，同等条件下可以选择年龄偏大的孕妇。