看一下白细胞分类，是不是都减少，还是哪一单项减少的更为明显。如果感觉一切正常，不经常感冒或有其它感染，也许问题不大。回中国略增高，很可能是对一些轻微感染的反应，比如空气污染。另外，如果当你发生感染，白细胞能迅速升高，说明你的造血功能正常。文献里是这样说的：
"For adults, counts of less than 1,500 neutrophils （中性粒细胞）per microliter of blood are considered to be neutropenia. Some people have lower-than-average neutrophil counts, but not an increased risk of infection. In these situations their neutropenia isn't a concern. Neutrophil counts less than 1,000 neutrophils per microliter — and especially counts of less than 500 neutrophils per microliter — are always considered to be neutropenia, where even the normal bacteria from your mouth and digestive tract can cause serious infections".
