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Thrombocytosis (throm-boe-sie-TOE-sis) is a disorder in which your body produces too many platelets. It's called reactive thrombocytosis or secondary thrombocytosis when the cause is an underlying condition, such as an infection.
Thrombocytosis, or a high platelet count, is diagnosed when platelet levels are greater than 450,000 platelets per microliter of blood. It's not always obvious when to worry about a high platelet count. Many times, a high platelet count isn't serious and may not cause symptoms.
Inflammatory conditions like autoimmune diseases, cancer or trauma, as well as certain infections and iron deficiency, are common causes of a high platelet count. Treatment is directed at the stimulus, and the platelet count returns to normal once resolved.
High platelets is a condition in which the blood contains more platelets than usual. Platelets, or thrombocytes, are small blood cell fragments that assist in blood clotting and help stop bleeding. Clinicians can identify a high platelet count through routine blood tests.
A platelet count measures the average platelet level in a person’s blood. High or low platelet levels can increase the risk of clotting or excessive bleeding.
A platelet count (PLT) is a quick, common test that counts the number of platelets in your blood. It’s important not to panic if you see your platelet counts flagged as “high” or “low” on your test results.
As thrombocytosis doesn’t typically cause symptoms, the first sign is often a high platelet count that shows up during routine blood work (complete blood count). Thrombocytosis involves having more than 450,000 platelets per microliter of blood.