Search results
Results from the WOW.Com Content Network
Leukocytosis can be subcategorized by the type of white blood cell that is increased in number. Leukocytosis in which neutrophils are elevated is neutrophilia; leukocytosis in which lymphocyte count is elevated is lymphocytosis; leukocytosis in which monocyte count is elevated is monocytosis; and leukocytosis in which eosinophil count is elevated is eosinophilia.
Conventionally, a leukocytosis exceeding 50,000 WBC/mm 3 with a significant increase in early neutrophil precursors is referred to as a leukemoid reaction. [2] The peripheral blood smear may show myelocytes, metamyelocytes, promyelocytes, and rarely myeloblasts; however, there is a mixture of early mature neutrophil precursors, in contrast to the immature forms typically seen in acute leukemia.
An excess of white blood cells is usually due to infection or inflammation. Less commonly, a high white blood cell count could indicate certain blood cancers or bone marrow disorders. The number of leukocytes in the blood is often an indicator of disease, and thus the white blood cell count is an important subset of the complete blood count.
Neutrophils are the primary white blood cells that respond to a bacterial infection, so the most common cause of neutrophilia is a bacterial infection, especially pyogenic infections. [2] Neutrophils are also increased in any acute inflammation, so will be raised after a heart attack, [2] other infarct or burns. [2]
The standard definition of a left shift is an absolute band form count greater than 7700/microL. [3] There are competing explanations for the origin of the phrase "left shift," including the left-most button arrangement of early cell sorting machines [4] [5] and a 1920s publication by Josef Arneth, containing a graph in which immature neutrophils, with fewer segments, shifted the median left. [6]
This occurs when there is in an increase in a specific type of white blood cells but the number remains less than 5 billion cells per liter (L) (5x10 9 /L) of blood. [33] This subtype, termed chronic lymphocytic leukemia-type MBL (CLL-type MBL) is an asymptomatic, indolent, and chronic disorder in which people exhibit a mild increase in the ...
Leukostasis (also called symptomatic hyperleukocytosis) is a medical emergency most commonly seen in patients with acute myeloid leukemia.It is characterized by an extremely elevated blast cell count and symptoms of decreased tissue perfusion.
Tachypnea (high respiratory rate), with greater than 20 breaths per minute; or, an arterial partial pressure of carbon dioxide less than 4.3 kPa (32 mmHg) White blood cell count less than 4000 cells/mm³ (4 x 10 9 cells/L) or greater than 12,000 cells/mm³ (12 x 10 9 cells/L); or the presence of greater than 10% immature neutrophils (band forms).