Thrombocyte count DefinitionA platelet count is a lab test to measure how many platelets you have in your blood. Platelets are particles in the blood that help the blood clot. They are smaller than red or white blood cells. How the Test is PerformedHow to Prepare for the TestMost of the time you do not need to take special steps before this test. How the Test will FeelWhen the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away. Why the Test is PerformedThe number of platelets in your blood can be affected by many diseases. Platelets may be counted to monitor or diagnose diseases, or to look for the cause of too much bleeding or clotting. Normal ResultsThe normal number of platelets in the blood is 150,000 to 400,000 platelets per microliter (mcL) or 150 to 400 × 109/L. Normal value ranges may vary slightly. Some labs use different measurements or may test different specimens. Talk to your health care provider about your test results. What Abnormal Results MeanLOW PLATELET COUNT A low platelet count is below 150,000 (150 × 109/L). If your platelet count is below 50,000 (50 × 109/L), your risk for bleeding is higher. Even every day activities can cause bleeding. A lower-than-normal platelet count is called thrombocytopenia. Low platelet count can be divided into 3 main causes:
Three of the more common causes of this problem are:
If your platelet count is low, talk to your provider about how to prevent bleeding and what to do if you are bleeding. HIGH PLATELET COUNT A high platelet count is 400,000 (400 × 109/L) or above. A higher-than-normal number of platelets is called thrombocytosis. It means your body is making too many platelets. Causes may include:
Some people with high platelet counts may be at risk for forming blood clots or even bleeding too much. Blood clots can lead to serious medical problems. RisksThere is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others. Other risks associated with having blood drawn are slight, but may include:
ReferencesIancu-Rubin C, Cantor AB. Thrombocytopoiesis. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 29. Schafer AI. Approach to the patient with bleeding and thrombosis. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 162. | |
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Review Date: 2/2/2023 Reviewed By: Mark Levin, MD, Hematologist and Oncologist, Monsey, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. Any duplication or distribution of the information contained herein is strictly prohibited. | |
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