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In hematology, thrombocythemia is a condition of high platelet (thrombocyte) count in the blood. Normal count is in the range of 150 × 10 9 to 450 × 10 9 platelets per liter of blood, [1] but investigation is typically only considered if the upper limit exceeds 750 × 10 9 /L.
Hydroxycarbamide, interferon-α and anagrelide can lower the platelet count. Low-dose aspirin is used to reduce the risk of blood clot formation unless the platelet count is very high, where there is a risk of bleeding from the disease, and hence this measure would be counter-productive as aspirin-use increases the risk of bleeding. [3] [15 ...
Bruising, particularly purpura in the forearms and petechiae in the feet, legs, and mucous membranes, may be caused by spontaneous bleeding under the skin. [8] [9] Eliciting a full medical history is vital to ensure the low platelet count is not secondary to another disorder.
Giant platelet disorders can be further categorized: [6] caused by auto-immune disorders, for example Immune thrombocytopenic purpura (ITP), and characterized by low platelet count, but high MPV (mean platelet volume). [7] Caused by glycoprotein abnormalities: Bernard–Soulier syndrome, velocardiofacial syndrome
Unlike ITP, the platelet count in gestational thrombocytopenia rarely goes below 100,000, and a platelet count below 80,000 is even more rare (seen in less than 0.1% of cases of gestational thrombocytopenia). Also unlike ITP, gestational thrombocytopenia is not a cause of neonatal or maternal bleeding, or neonatal thrombocytopenia. [63]
Bleeding time is a medical test done to assess the function of a person's platelets. It involves making a patient bleed, then timing how long it takes for them to stop bleeding using a stopwatch or other suitable devices. The term template bleeding time is used when the test is performed to standardized parameters.
SPS is diagnosed by demonstrating platelet hyperaggregability. In a lab test called aggregometry, platelet stickiness is stimulated with epinephrine (EPI) and/or adenosine diphosphate (ADP). [12] This test is not possible for patients being treated with acetylsalicylic acid until that substance has sufficiently cleared from their system.
A rapidly declining platelet count; High levels of fibrin degradation products, including D-dimer, are found owing to the intense fibrinolytic activity stimulated by the presence of fibrin in the circulation. The peripheral blood smear may show fragmented red blood cells (known as schistocytes) due to shear stress from thrombi. However, this ...
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