Is white blood cell count of 18,000 cells/L low or high? If yes, what is the normal WBC in cells/L?

I found this on Google.

"Normal Results
The normal number of WBCs in the blood is 4,500 to 11,000 WBCs per microliter (4.5 to 11.0 × 109/L). Normal value ranges may vary slightly among different labs. Some labs use different measurements or may test different specimens."