（一）高未结合胆红素血症引起的原因有：①胆红素产生过多：如母婴血型不合、遗传性球形红细胞增多症、红细胞酶的缺陷（如G-6-PD、丙酮酸激酶、己糖激酶等）、血管外溶血、红细胞增多症等；②肝细胞摄取和结合低下：如肝脏酶系统功能不全引起的黄疸、甲状腺功能低下、进食减少等；③肠-肝循环增加：如胎粪排出延迟等。
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