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  2. Thrombocythemia - Wikipedia

    en.wikipedia.org/wiki/Thrombocythemia

    The condition arises from a fault in the bone marrow cells leading to over-production of platelets but the cause of the fault is unknown, and this type is not common. [2] When the cause is known such as another disorder or disease, the term thrombocytosis is preferred, as either secondary or reactive thrombocytosis. Reactive thrombocytosis is ...

  3. Pseudothrombocytopenia - Wikipedia

    en.wikipedia.org/wiki/Pseudothrombocytopenia

    EDTA-dependent agglutination. In some individuals, clinically insignificant antibodies may cause in vitro agglutination of platelets. As a result of platelet clumping, platelet counts reported by automated counters may be much lower than the actual count in the blood because these devices cannot differentiate platelet clumps from individual cells.

  4. Thrombocytopenia - Wikipedia

    en.wikipedia.org/wiki/Thrombocytopenia

    One common definition of thrombocytopenia requiring emergency treatment is a platelet count below 50,000/μL. [5] Thrombocytopenia can be contrasted with the conditions associated with an abnormally high level of platelets in the blood – thrombocythemia (when the cause is unknown), and thrombocytosis (when the cause is known). [6] [7]

  5. Essential thrombocythemia - Wikipedia

    en.wikipedia.org/wiki/Essential_thrombocythemia

    Platelets derived from the abnormal megakaryocytes are activated, which, along with the elevated platelet count, contributes to the likelihood of forming blood clots. [8] The increased possibility of bleeding when the platelet count is over 1 million is due to von Willebrand factor (vWF) sequestration by the increased mass of platelets, leaving ...

  6. Giant platelet disorder - Wikipedia

    en.wikipedia.org/wiki/Giant_platelet_disorder

    Problems later in life may arise from anything that can cause internal bleeding such as: stomach ulcers, surgery, trauma, or menstruation. [2] Abnormality of the abdomen, nosebleeds , heavy menstrual bleeding , purpura , too few platelets circulating in the blood , and prolonged bleeding time have also been listed as symptoms of various giant ...

  7. Immune-mediated thrombocytopaenia - Wikipedia

    en.wikipedia.org/wiki/Immune-mediated...

    Destruction of platelets occurs when immunoglobins attach to the surface of the platelet, which causes macrophages to initiate phagocytosis. [2] IMT is differentiated from other forms of thrombocytopaenia by the immune-mediated component of the condition.

  8. Heparin-induced thrombocytopenia - Wikipedia

    en.wikipedia.org/wiki/Heparin-induced...

    Initially, various theories existed about the exact cause of the low platelets in HIT. Gradually, evidence accumulated on the exact underlying mechanism. [ 4 ] In 1984–1986, John G. Kelton and colleagues at McMaster University Medical School developed the laboratory tests that could be used to confirm or exclude heparin-induced thrombocytopenia.

  9. Platelet storage pool deficiency - Wikipedia

    en.wikipedia.org/wiki/Platelet_storage_pool...

    Platelet storage pool deficiency is a family of clotting disorders characterized by deficient granules in platelets. Individuals with these disorders have too few or abnormally functioning alpha granules , delta granules , or both alpha and delta granules and are therefore unable to form effective clots, which leads to prolonged bleeding.