差太多肯定是Unit，别的可能是１）Lab方法不一样２）还可能是年纪，小孩跟大人正常值不一样３）地理位置，各地的人群不一样

These values vary somewhat among laboratories, due to methodology and even geography. Blood tests and Blood testing methods and quality vary widely in different parts of the world and in different parts of many countries, due to characteristics in the population, both racial Blood differences and ethnic Blood characteristics, among other factors.