An average normal range for white blood cells is between 4,500 and 10,000 mcl. Abnormal test results are classified by numbers that are higher or lower than this range. It’s important to note that age can also affect the number of white blood cells, with infants having a higher count than adults.t is normal for doctors to order a complete blood count and check your WBC count during an annual physical examination. Your doctor may recommend a WBC count if you complain of persistent body aches, fever, chills, or headaches.