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Leukocytosis is a condition in which the white cell count is above the normal range in the blood. [1] [2] It is frequently a sign of an inflammatory response, [3] most commonly the result of infection, but may also occur following certain parasitic infections or bone tumors as well as leukemia.
These blood cells are not fully developed and are called blasts or leukemia cells. [2] Symptoms may include bleeding and bruising, bone pain, fatigue, fever, and an increased risk of infections. [2] These symptoms occur due to a lack of normal blood cells. [2] Diagnosis is typically made by blood tests or bone marrow biopsy. [2]
The term leukemoid reaction describes an increased white blood cell count (> 50,000 cells/μL), which is a physiological response to stress or infection (as opposed to a primary blood malignancy, such as leukemia). It often describes the presence of immature cells such as myeloblasts or red blood cells with nuclei in the peripheral blood.
The underlying mechanism involves replacement of normal bone marrow with leukemia cells, which results in a drop in red blood cells, platelets, and normal white blood cells. [1] Diagnosis is generally based on bone marrow aspiration and specific blood tests. [3] AML has several subtypes for which treatments and outcomes may vary. [1]
The clinical signs and symptoms of leukostasis are non-specific but should be suspected in susceptible individuals with leukemia, a high white blood cell count (e.g., over 100,000), and new-onset neurologic or respiratory signs or symptoms.
The excessive immature lymphocytes in the bone marrow interfere with the production of new red blood cells, white blood cells, and platelets. [1] Diagnosis is typically based on blood tests and bone marrow examination. [3] Acute lymphoblastic leukemia is typically treated initially with chemotherapy aimed at bringing about remission. [2]
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