查了下，确实跟VD指标类似，美国不同州的 normal range还不同，正常范围除了上面2.5 -- 7，还有。。

Neutrophils normal range

Normal neutrophil counts depend on different factors such as age — but generally, a normal neutrophil level is between 2,500 and 7,000 neutrophils per microliter. A low neutrophil level is less than 45% of your total white blood cells or 1,500 neutrophils per microliter. A high neutrophil level is over 7,700 neutrophils per microliter.

https://www.webmd.com/a-to-z-guides/what-to-know-neutrophils

正常范围，除了上面2.5 -- 7，和您那1.5--8.  还有些州为1.5 -- 7，还有1.45 -- 7.7 和2.5--8 的。