Tracy Koroma answered This means that your mom’s white blood cell count is very high - the average range is between 4,300 to 10,800. What Can Cause Someone’s White Blood Cell Count To Be Over 30,000? InfectionIllnessInflammationLeukemia Allergy It’s good that your mom has already seen the doctor – they should be able to find out what’s wrong, and then she can be treated.What Are White Blood Cells? White blood cells, also called leukocytes, are what your body generates to fight infection.When you’re sick, your white blood cell count will be higher than usual. When you’re healthy, your white blood cells only make up about 1% of your blood.Think of your white blood cells as a police force. When the city is peaceful, they only need a few officers patrolling the streets.However, if a huge bank robbery takes place, there’ll be cop cars and police officers everywhere!