Thrombocytosis involves having an elevated level of platelets in your blood. Too many platelets can cause a stroke, heart attack or clot in your blood vessels.

Dec 30, 2022 · This condition occurs when your body produces too many platelets, the cells that help blood clot. Thrombocytosis can cause clotting or bleeding problems.

Jun 17, 2022 · High platelet levels are often detected during routine blood tests. They may not always present noticeable symptoms, though you may experience bleeding or clotting issues. Treatment …

Mar 19, 2025 · What Is a High Platelet Count? A high platelet count is more than 450,000 platelets per microliter of blood. 3 There are two types: With primary thrombocytosis —also called essential …

When platelets are high, clots form more easily in the blood vessels, reducing blood flow. The decreased blood flow results in various complications, such as stroke and pulmonary embolism. Platelets or …

Apr 23, 2025 · Thrombocytosis is defined as an elevated platelet count (high platelet count) in the peripheral blood, typically above the upper limit of the normal reference range. What are platelets?

High-risk patients, or those with extremely high platelet counts, often require cytoreductive therapy to actively reduce the number of platelets produced by the bone marrow. Hydroxyurea is a common …

Nov 17, 2025 · A high platelet count or thrombocytosis happens when your blood has more platelets than normal. Your blood test results are considered normal if they show between 150,000 and …

Jul 3, 2025 · Thrombocytosis refers to an increased platelet count, which, in this review, is ≥450,000/microL (≥450 × 10 9 /L). This topic discusses our approach to the adult or child with …

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 …