新生儿红细胞增多症(Neonatal Polycy-thaemia)顾名思义是指新生儿生后头几天有红细胞数异常增多,且伴有血红蛋白及血球压积的异常升高。正常新生儿生后1周内红细胞数在500～700万之间,血红蛋白在14.7～21.0克/分升,静脉红细胞压积在45～65%或毛细血管红细胞压积约在65～70%之间,当新生儿生后2周内红细胞数>700万、血红蛋白 Neonatal polycythaemia (Neonatal Polycy-thaemia), as its name implies, refers to the abnormal increase of erythrocyte number in the first few days after birth, accompanied by an abnormal increase of hemoglobin and hematocrit. Normal newborns 1 week after birth, the number of red blood cells in the 5-7 million, hemoglobin 14.7 ~ 21.0 g / dL, venous hematocrit 45 ~ 65% or capillary hematocrit about 65 ~ 70% Between the number of red blood cells> 7 million when 2 weeks after birth, hemoglobin