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  1. A platelet count is a quick, common test that counts the number of platelets in your blood. Platelets are cells that help your blood clot. A low platelet count might be a sign of certain cancers or infections. A high platelet count can put you at risk for harmful blood clots or stroke.

  2. Mar 24, 2022 · Thrombocytosis refers to a high platelet count caused by another disease or condition. This condition is often called secondary or reactive thrombocytosis. Thrombocytosis is more common than thrombocythemia. What are the symptoms? Many people who have thrombocythemia or thrombocytosis do not have symptoms.

  3. QUICK FACTS. High Platelet Count. (Thrombocythemia) By The Manual's Editorial Staff. Reviewed/Revised May 2022 | Modified Sep 2022. VIEW PROFESSIONAL VERSION. Get the full details. What causes a high platelet count? |. What are the complications of a high platelet count? |. What are the symptoms of a high platelet count? |.

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