What is considered a high white blood cell count?
The normal value of white blood count is around 5,000 and 10,000 cells per mL. In children and adults, we should suspect something is severely wrong when this number goes beyond 20,000 cells per mL. In these cases, doctors usually require a confirmatory test and other blood tests including coagulation tests and various chemical and microscopic analysis, depending on your symptoms. In other cases, you may have abnormally low red blood cell count, in which case leukemia will not be automatically ruled out.
Read also Understanding White Blood Cell Count (Normal, High, & Low).