leukocyte count

count [kownt]

a numerical computation or indication.

Addis count the determination of the number of erythrocytes, leukocytes, epithelial cells, and casts, and the protein content in an aliquot of a 12-hour urine specimen; used in the diagnosis and management of kidney disease.

blood count (blood cell count) see blood count.

blood count, complete a series of tests of the peripheral blood, including the erythrocyte count, erythrocyte indices, leukocyte counts, and sometimes platelet count.

blood count, differential differential leukocyte count.

erythrocyte count determination of the number of erythrocytes in a unit volume of blood that has been diluted in an isotonic solution, done with an automatic counter such as a flow cytometer. Called also red blood cell or red cell count.

leukocyte count determination of the number of leukocytes in a unit volume of blood, usually after the erythrocytes have been lysed and the blood has been diluted; it may be done either manually with a hemacytometer or electronically. See total leukocyte c. and differential leukocyte c. Called also white blood cell or white cell count.

leukocyte count, differential a leukocyte count that calculates the percentages of different types. See also total leukocyte count.

leukocyte count, total a leukocyte count measuring the total number of all the types in a given volume of blood. See also differential leukocyte count.

platelet count determination of the total number of platelets per cubic millimeter of blood; the direct platelet count simply counts the cells using a microscope, and the indirect platelet count determines the ratio of platelets to erythrocytes on a peripheral blood smear and computes the number of platelets from the erythrocyte count.

red blood cell count (red cell count) erythrocyte count.

reticulocyte count a calculation of the number of reticulocytes in 1 cu mm of peripheral blood, recorded either as an absolute number or as the percentage of the erythrocyte count. It provides a means of assessing the erythropoietic activity of the bone marrow.

white blood cell count (white cell count) leukocyte count.

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leukocyte (lōō´kōsīt),

n a white blood cell circulating in the blood. See also lymphocyte and monocyte.

leukocyte, basophilic (basophil),

n a type that has coarse granules stainable with basic dyes and a bent lobed nucleus.

leukocyte count,

n the number of white blood cells in a cubic millimeter of blood. Normal values range from 5000 to 10,000/mm³.

leukocyte, eosinophilic (eosinophil),

n a type that has coarse granules stainable with eosin and a bilobed nucleus.

leukocyte, immature,

n a form of white blood cell usually found in disease (e.g., myelocytes, myeloblasts, lymphoblasts).

leukocyte, monocyte,

n an agranulocyte white blood cell.

leukocyte, polymorphonuclear (PMN), (neutrophil),

n 1. a type with finely granular cytoplasm, an irregularly lobulated nucleus, and the appearance of a microphage. It is found in the tissues during acute inflammatory processes and in the superficial surface aspects of a lesion during subacute or chronic inflammation. It is the predominating leukocyte of the blood. Blood levels may be increased during acute inflammatory states and myelogenous leukemia, and decreased in agranulocytosis. See also neutropenia; polymorphonuclear leukocyte; neutrophilia.

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leukocyte

a white blood cell capable of ameboid movement, whose chief function is to protect the body against microorganisms causing disease and which comprise: granulocytes (basophils, eosinophils, neutrophils), nongranulocytes (lymphocytes, monocytes) and thrombocytes (platelets).

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bovine leukocyte adhesion deficiency

lethal hematological defect inherited as a recessive trait in Holstein cattle; characterized by poor growth, recurrent infection and poor responsivity to standard treatments in calves from 2 to 8 weeks of age. Profound neutrophilia. Death supervenes before two years of age. Called also BLAD.

canine leukocyte adhesion deficiency

an autosomal recessive disease in Irish setters. Neutrophils lack CD11/CD18 adhesion proteins. Affected dogs have a marked neutrophilia and recurrent bacterial infections from an early age.

leukocyte count

tabulation of the numbers and kinds of leukocytes in a blood sample.

endothelial leukocyte

see endotheliocyte.

leukocyte functional antigens

a group of cell surface antigens involved in intracellular adhesion.

granular l's

granulocytes; leukocytes containing abundant granules (lysosomes) in their cytoplasm, including neutrophils, eosinophils and basophils.

leukocyte migration-inhibition factor

a lymphokine elaborated by activated T or B lymphocytes that inhibits polymorphonuclear leukocyte migration.

polymorphonuclear leukocyte

any of the fully developed, segmented cells of the granulocyte series, especially a neutrophil, whose nuclei contain three or more lobes joined by filamentous connections.

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leukocyte count

see White cell count