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left shiftHematology An ↑ in a peripheral blood smear of immature granulocytes with ↓ nuclear segmentation, ie 'band' forms, due to ↑ production of myeloid cells in the BM, caused by acute infection Physiology An ↑ in Hb's affinity for O2–as represented by the oxygen dissociation curve, where the P50 is ↓ and shifted to the left, as occurs with ↑ pH–Bohr effect or ↓ temperature. Cf Right shift.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
1. In hematology, an increase in the number of immature polymorphonuclear leukocytes in the circulating blood. See: Arneth's classification of neutrophils
2. In acid-base physiology, a left-shifted oxyhemoglobin dissociation level, indicating an increased affinity of hemoglobin for oxygen.Synonym: shift to the left
See also: shift
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