Is a platelet count of 404*10^9/L at age 11 considered normal, and do further checks need to be conducted?

Possible symptoms and treatment methods when platelet counts are elevated.

Medical recommendations for a 6-month-old baby with an abnormal platelet count

After treatment for pneumonia, a child’s platelet and white blood cell counts are elevated, which may be a sign of body inflammation. It is recommended to take symptomatic anti-inflammatory medication and observe the changes in the condition.