What Causes High Platelet Count in Infants?

My daughter is 15 days old and I took her for a blood test today. One of the results showed her platelet count was elevated at 669X10^9/L, with the normal range being 100-300X10^9/L. Is this a problem? It is recommended to bring the child to a hematology department for a detailed examination to determine the cause and then provide treatment accordingly. A platelet count of 440X10^9/L in infants is not particularly high. Children’s platelet counts may be higher than the normal level. Many factors can affect platelet numbers. No additional treatment is needed for other indicators; observation is sufficient. If the infant shows no other abnormalities, it is recommended to observe for a period of time. If the total count remains high, relevant checks should be conducted.
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What Causes High Platelets in Children?

My nine-month-old son had a fever and viral cold with throat ulcers and was hospitalized for six days. When discharged, his blood platelet count was 500, and it was 545 the next day. The doctor suspected ‘Kawasaki disease,’ but there were no symptoms of Kawasaki disease. I’m desperate and don’t know what the cause is. I hope for an answer, thank you!
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