Left shift or blood shift is an increase in the number of immature leukocytes in the peripheral blood , particularly neutrophil band cells. Less commonly, left shift may also refer to a similar phenomenon in  severe anemia, when  reticulocytes and immature erythrocyte precursors appear in the peripheral circulation. Definition The standard definition of a left shift is an absolute band form count greater than 7700/microL. There are competing explanations for the origin of the phrase "left shift," including the left-most button arrangement of early cell sorting URL and a 1920s publication by Josef Arneth, containing a graph in which immature neutrophils, with fewer segments, shifted the median left  .
Left shift or blood shift is an increase in the number of immature cell types among the blood cells in a sample of blood. Many (perhaps most) clinical mentions of left shift refer to the white blood cell lineage, particularly neutrophil-precursor band cells, thus signifying bandemia. Less commonly, left shift may also refer to a similar phenomenon in the red blood cell lineage in severe anemia, when increased reticulocytes and immature erythrocyte-precursor cells appear in the peripheral circulation. Definition The standard definition of a left shift is an absolute band form count greater than 7700/microL. There are competing explanations for the origin of the phrase "left shift," including the left-most button arrangement of early cell sorting URL and a 1920s publication by Josef Arneth, containing a graph in which immature neutrophils, with fewer segments, shifted the median left . In the latter view, the name reflects a curve's preponderance shifting to the left on a graph of hematopoietic cellular differentiations .
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leukocytes in the peripheral blood , particularly neutrophil band cells.
cell types among the blood cells in a sample of blood. Many (perhaps most) clinical mentions of left shift refer to the white blood cell lineage, particularly neutrophil-precursor band cells, thus signifying bandemia.
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the red blood cell lineage in
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increased
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erythrocyte precursors
erythrocyte-precursor cells
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. In the latter view, the name reflects a curve's preponderance shifting to the left on a graph of hematopoietic cellular differentiations