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What could cause high white blood cell count in a child?

MY son has high white blood cell count he s only 5. what could be wrong with him he also wants to check his kidneys he said do not get to worried?
There are a few different causes of an elevated white blood cell count. Since the white blood cell are involved in fighting off infections in the body, almost always a white blood cell count that is elevated means that your son has just been fighting off an infection. The most common scenario in which this occurs is that you bring your child to the pediatrician for a regular checkup visit, and the doctor orders routine checkup blood work that comes back with a high white blood cell count. This typically just means that your son has just gotten over some viral infection (like a common cold), and the usual thing to be done is to just repeat the blood work in a few weeks to make sure that the count has come down. In rare cases, a high white blood cell count can be a sign of a serious problem, most typically a blood cancer like a leukemia or a lymphoma. Even though this is not at all common, this is the reason that your pediatrician is being cautious and checking additional blood work. It will be important to followup closely with them to make sure that everything turns out normal.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.
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