| factor X n. See prothrombinase. |
factor X,
a coagulation factor that occurs in normal plasma but is deficient in some inherited defects in coagulation. Factor X and prothrombin are closely related. Both are synthesized in the liver in the presence of vitamin K. Formerly called thrombokinase. Also called Stuart-Prower factor.
factor [fak´ter]
an agent or element that contributes to the production of a result.
accelerator factor factor V, one of the coagulation factors.
factor I see coagulation factors.
factor II see coagulation factors.
factor III see coagulation factors.
factor IV see coagulation factors.
factor V see coagulation factors.
factor VI see coagulation factors.
factor VII see coagulation factors.
factor VIII see coagulation factors.
factor IX see coagulation factors.
factor X see coagulation factors.
factor XI see coagulation factors.
factor XII see coagulation factors.
factor XIII see coagulation factors.
angiogenesis factor a substance that causes the growth of new blood vessels, found in tissues with high metabolic requirements such as cancers and the retina. It is also released by hypoxic macrophages at the edges or outer surface of a wound and initiates revascularization in wound healing.
antihemophilic factor (AHF)
1. factor VIII, one of the coagulation factors.
2. a preparation of factor VIII administered intravenously for the prevention or treatment of hemorrhage in patients with hemophilia A and the treatment of von Willebrand disease, hypofibrinogenemia, and coagulation factor XIII deficiency. Included are preparations derived from human plasma (antihemophilic factor, cryoprecipitated antihemophilic factor) or porcine plasma (antihemophilic factor [porcine]) and those produced by recombinant technology antihemophilic factor [recombinant]).
antihemophilic factor A factor VIII, one of the coagulation factors.
antihemophilic factor B factor IX, one of the coagulation factors.
antihemophilic factor C factor XI, one of the coagulation factors.
antihemorrhagic factor vitamin K.
antinuclear factor (ANF) antinuclear antibody.
antirachitic factor vitamin D.
atrial natriuretic factor (ANF) a hormone produced in the cardiac atrium; an inhibitor of renin secretion and thus of the production of angiotensin, and a stimulator of aldosterone release. Its effect is increased excretion of water and sodium and a lowering of blood pressure.
factor B a complement component that participates in the alternative complement pathway.
blastogenic factor lymphocyte-transforming factor.
carative f's in the theory of human caring, a set of ten factors that offer a descriptive topology of interventions including (1) a humanistic-altruistic system of values; (2) faith-hope; (3) sensitivity to self and others; (4) a helping-trusting, human care relationship; (5) the expression of positive and negative feelings; (6) a creative problem-solving caring process; (7) transpersonal teaching and learning; (8) a supportive, protective, and/or corrective mental, physical, societal, and spiritual environment; (9) human needs assistance; and (10) existential-phenomenological-spiritual forces.
Christmas factor factor IX, one of the coagulation factors.
citrovorum factor folinic acid.
clotting f's coagulation factors.
C3 nephritic factor (C3 NeF) an autoantibody that stabilizes the alternative complement pathway C3 convertase, preventing its inactivation by factor h, resulting in complete consumption of plasma C3; it is found in the serum of many patients with type II membranoproliferative glomerulonephritis.
coagulation f's see coagulation factors.
colony-stimulating factor (CSF) any of a number of glycoproteins responsible for the proliferation, differentiation, and functional activation of hematopoietic progenitor cells; specific factors are named for the cell lines that they stimulate. Used to promote bone marrow proliferation in aplastic anemia, following cytotoxic chemotherapy, or following bone marrow transplantation. Types include granulocyte, granulocyte-macrophage, and macrophage colony-stimulating factors.
factor D a factor that when activated serves as a serine esterase in the alternative complement pathway.
decay accelerating factor (DAF) a protein of most blood as well as endothelial and epithelial cells, CD55 (see CD antigen); it protects the cell membranes from attack by autologous complement.
endothelial-derived relaxant factor (endothelial-derived relaxing factor) (endothelium-derived relaxing factor (EDRF)) nitric oxide.
extrinsic factor cyanocobalamin.
F factor (fertility factor) F plasmid.
fibrin-stabilizing factor (FSF) factor XIII, one of the coagulation factors.
Fitzgerald factor high-molecular-weight kininogen.
Fletcher factor prekallikrein.
granulocyte colony-stimulating factor (G-CSF) a colony-stimulating factor that stimulates production of neutrophils from precursor cells.
granulocyte-macrophage colony-stimulating factor (GM-CSF) a colony-stimulating factor that binds to stem cells and most myelocytes and stimulates their differentiation into granulocytes and macrophages.
growth factor any substance that promotes skeletal or somatic growth; usually a mineral, hormone, or vitamin.
factor H a complement system regulatory protein that inhibits the alternative pathway of complement activation.
Hageman factor (HF) factor XII, one of the coagulation factors. See illustration.
Activation of Hageman factor (factor XII) leads to increased vascular permeability, clotting, and thrombolysis. From Damjanov, 2000.
hematopoietic growth f's a group of substances with the ability to support hematopoietic colony formation in vitro, including erythropoietin, interleukin-3, and colony-stimulating factors. All except erythropoietin stimulate mature cells, have overlapping capabilities to affect progenitor cells of several blood cell lines, and also affect cells outside the hematopoietic system.
histamine-releasing factor (HRF) a lymphokine, believed to be produced by macrophages and B lymphocytes, that induces the release of histamine by IgE-bound basophils. It occurs in late phase allergic reaction, six or more hours after contact with the antigen, in sensitive individuals.
homologous restriction factor (HRF) a regulatory protein that binds to the membrane attack complex in autologous cells, inhibiting the final stages of complement activation.
factor I a plasma enzyme that regulates both classical and alternative pathways of complement activation by inactivating their C3 convertases.
immunoglobulin-binding factor (IBF) a lymphokine having the ability to bind IgG complexed with antigen and prevent complement activation.
insulinlike growth f's (IGF) insulinlike substances in serum that do not react with insulin antibodies; they are growth hormone–dependent and possess all the growth-promoting properties of the somatomedins.
intensification factor in radiology, the comparative increase in light transmission when films are exposed in the presence of intensifying screens compared to that in the absence of screens.
intrinsic factor a glycoprotein secreted by the parietal cells of the gastric glands, necessary for the absorption of cyanocobalamin (vitamin B12). Its absence results in pernicious anemia.
LE factor an immunoglobulin that reacts with leukocyte nuclei, found in the serum in systemic lupus erythematosus.
lymph node permeability factor (LNPF) a substance from normal lymph nodes that produces vascular permeability.
lymphocyte mitogenic factor (LMF) (lymphocyte-transforming factor) a substance that is released by lymphocytes stimulated by specific antigen and causes nonstimulated lymphocytes to undergo blast transformation and cell division; called also blastogenic factor.
macrophage-activating factor (MAF) interferon-α.
macrophage colony-stimulating factor (M-CSF) a colony-stimulating factor secreted by macrophages, stimulated endothelial cells, and most tissues, that stimulates the production of macrophages from precursor cells and maintains the viability of mature macrophages in vitro.
macrophage chemotactic factor (MCF) a lymphokine that attracts macrophages to the invasion site.
macrophage-derived growth factor a substance released by macrophages below the surface of a wound that induces the proliferation of fibroblasts.
macrophage inhibition factor (macrophage inhibitory factor) migration inhibitory factor.
migration inhibition factor (migration inhibitory factor) a lymphokine that inhibits macrophage migration.
minification factor in radiology, the gain in light achieved by a reduction in size of the output phosphor from the input phosphor size.
osteoclast-activating factor (OAF) a lymphokine that stimulates bone resorption; it may be involved in the bone resorption associated with multiple myeloma and other hematologic neoplasms or inflammatory disorders such as rheumatoid arthritis and periodontal disease.
factor P properdin.
platelet f's see platelet factors.
platelet-activating factor (PAF) a substance released by basophils and mast cells in immediate hypersensitivity reactions, and by macrophages and neutrophils in other inflammatory reactions; it leads to bronchoconstriction, platelet aggregation, and release of vasoactive substances from platelets.
platelet-derived growth factor a substance contained in platelets and capable of inducing proliferation of vascular endothelial cells, vascular smooth muscle cells, fibroblasts, and glial cells; its action contributes to the repair of damaged vascular walls.
R factor R plasmid.
releasing f's factors elaborated in one structure (as in the hypothalamus) that effect the release of hormones from another structure (as from the anterior pituitary gland), including corticotropin-releasing factor, melanocyte-stimulating hormone–releasing factor, and prolactin-releasing factor. Applied to substances of unknown chemical structure, while substances of established chemical identity are called releasing hormones.
resistance factor R f.
Rh factor a type of agglutinogen found on some erythrocytes; see also rh factor.
rheumatoid factor (RF) antibodies directed against antigenic determinants on IgG molecules, found in the serum of about 80 per cent of patients with classic or definite rheumatoid arthritis; but in only about 20 per cent of patients with juvenile rheumatoid arthritis; rheumatoid factors may be IgM, IgG, or IgA antibodies, although serologic tests measure only IgM. Rheumatoid factors also occur in other connective tissue diseases and infectious diseases.
risk factor an agent or situation that is known to make an individual or population more susceptible to the development of a specific negative condition.
risk factor (omaha) an environmental, psychosocial, or physiologic event or health related behavior that increases the client's exposure or vulnerability to the development of a client problem; the nurse's knowledge base of risk factors is used to identify potential problem modifiers in the Problem Classification scheme of the omaha system.
stable factor factor VII, one of the coagulation factors.
Stuart factor (Stuart-Prower factor) factor X, one of the coagulation factors.
sun protection factor (SPF) a numerical rating of the amount of protection afforded by a sunscreen; the higher the number, the more protection is provided.
tissue factor factor III, one of the coagulation factors.
transfer factor (TF) a factor occurring in sensitized lymphocytes that can transfer delayed hypersensitivity to a formerly nonreactive individual; see also transfer factor.
tumor necrosis factor (TNF) either of two lymphokines produced primarily by cells of the immune system, capable of causing in vivo hemorrhagic necrosis of certain tumor cells but not normal cells. They also destroy cells associated with the inflammatory response. They have been used as experimental anticancer agents but can also induce shock when bacterial endotoxins cause their release. Tumor necrosis factor α, formerly called cachectin, contains 157 amino acids and is produced by macrophages, eosinophils, and NK cells. Tumor necrosis factor β is lymphotoxin and contains 171 amino acids.
vascular endothelial growth factor (VEGF) (vascular permeability factor (VPF)) a peptide factor that stimulates the proliferation of cells of the endothelium of blood vessels; it promotes tissue vascularization and is important in blood vessel formation in tumors.
von Willebrand's factor (vWF) a glycoprotein synthesized in endothelial cells and megakaryocytes that circulates complexed to coagulation factor VIII. It is involved in adhesion of platelets to damaged epithelial surfaces and may participate in platelet aggregation. Deficiency results in the prolonged bleeding time seen in von Willebrand's disease.
factor(s),
n a constituent, element, cause, or agent that influences a process or system; a gene; a dietary substance.
factor I (fibrinogen, profibrin),
n See fibrinogen.
factor II (prothrombin, component A, prothrombase, prothrombin B, thrombogen, thrombozyme),
n considered the only essential precursor of thrombin.
factor III (thromboplastin [tissue], thrombokinase, cytozyme platelet], thrombokinin [blood], thromboplastic protein),
n See thromboplastin.
factor IV (calcium, Ca),
n ionized and/or bound calcium, generally required for the coagulation of blood, although some early phases of coagulation and the thrombin-fibrinogen reaction can take place without calcium.
factor V (labile factor, proaccelerin, accelerin, acceleration factor, cofactor of thromboplastin, component A of prothrombin, plasma ac-globulin, plasma prothrombin conversion factor [PPCF], prothrombinase, prothrombin accelerator, prothrombin conversion accelerator I, thrombogen, thrombogene, proaccelerinaccelerin system),
n a factor apparently necessary for the formation of a prothrombin-converting substance in blood and tissue extracts–i.e., intrinsic and extrinsic prothrombin activators. A deficiency results in parahemophilia (hypoproaccelerinemia).
factor VI,
n term formerly used to indicate an intermediate product in the formation of thromboplastin and also used synonymously with accelerin and activated factor V. It has no designation at present.
factor VII (stable factor, serum prothrombin conversion accelerator SPCA], proconvertin, autoprothrombin I, cofactor V, component B of prothrombin,
cothromboplastin, kappa factor, precusor of serum prothrombin conversion accelerator [pro-SPCA], prothrombin conversion factor, prothrombin converting factor, prothrombin conversion accelerator II, proconvertinconvertin system, prothrombinogen, serozyme, stable factor),
n a factor that accelerates the conversion of prothrombin to thrombin in the presence of factors III, IV, and V; a serum factor necessary for the formation of extrinsic prothrombin activator.
n a factor that accelerates the conversion of prothrombin to thrombin in the presence of factors III, IV, and V; a serum factor necessary for the formation of extrinsic prothrombin activator.
factor VII deficiency,
n a deficiency associated with a lack of vitamin K. A deficiency may be congenital, or it may be acquired in liver disease, or from prothrombinopenic agents used in anticoagulation therapy; it results in a prolonged (quantitative) one-stage prothrombin time test.
factor VIII (antihemophilic factor [AHF], antihemophilic globulin, antihemophilic globulin A, antihemophilic factor A, plasma thromboplastin factor [PTF], plasmokinin, platelet cofactor I, prothrombokinase, thrombocatalysin, thrombocytolysin, thrombokatilysin, thromboplastic plasma component [TPC], thromboplastinogen),
n a factor essential for the formation of blood thromboplastin. A deficiency results in classic hemophilia (hemophilia A); the clotting time is prolonged, and thromboplastin and prothrombin conversion is diminished.
factor IX (Christmas factor, plasma thromboplastin component [PTC], antihemophilic factor B, antihemophilic globulin B, autoprothrombin II, beta prothromboplastin, plasma factor X, plasma thromboplastin factor B PTF-B], platelet cofactor II),
n a factor that is active in the formation of intrinsic blood thromboplastin. A deficiency results in Christmas disease (hemophilia B), which is caused by a decrease in the amount of thromboplastin formed.
factor X (Stuart-Prower factor, Stuart factor, Prower factor),
n a factor influencing the yield of intrinsic (plasma) thromboplastin. A deficiency results in a prolonged one-stage prothrombin time. Brain tissue or Russell's viper venom are used to test for thromboplastin deficiency.
factor XI (plasma thromboplastin antecedent [PTA], antihemophilic factor C, PTA factor, plasma thromboplastin factor C [PTF-C]),
n a factor related to intrinsic (plasma) thromboplastin activation, which occurs when blood is exposed to a foreign surface.
factor XI deficiency,
n a deficiency caused by an autosomal recessive gene resulting in a hemorrhagic tendency. See also hemophilia C.
factor XII (Hageman factor, antihemophilic factor D, clot-promoting factor, fifth plasma thromboplastin precursor, glass factor),
n a factor the absence of which results in a long clotting time and abnormal prothrombin consumption and thromboplastin generation tests when tests are carried out in glass tubes. No abnormal bleeding tendency occurs with a deficiency of the factor.
factor XIII,
n a coagulation factor present in normal plasma that acts with calcium to produce an insoluble fibrin clot. Also called
fibrinase or
fibrin stabilizing factor.
fibrinase or
fibrin stabilizing factor.
factor XIII deficiency,
n a deficiency caused by a deficiency of vitamin E.
factor, acceleration,
n See factor V.
factor, antihemophilic (AHF),
n See factor VIII.
factor, antihemophilic A,
n See factor VIII.
factor, antihemophilic B,
n See factor IX.
factor, antihemophilic C,
n See factor XI.
factor, antihemophilic D,
n See factor XII.
factor, antipernicious,
n See vitamin B12.
factor, C (contact factor, contact activation product, third thromboplastic factor),
n a coagulation accelerator product formed by the interaction of active factor XII and factor XI.
factor, Castle's intrinsic (intrinsic factor),
n.pr a factor produced by the gastric mucosa and possibly the duodenal mucosa, and considered to be responsible for the absorption of vitamin B12. See also anemia, pernicious.
factor, Christmas,
n See factor IX.
factor, clot-promoting,
n See factor XII.
factor, clotting,
n the “trace” proteins (excluding calcium) present in normal blood in such small amounts (except fibrinogen) that their presence is usually established by deductive reasoning and by genetic and biochemical characteristics. They are associated with thromboplastic activity and the conversion of prothrombin to thrombin.
factor, contact,
n See factor C.
factor, environmental,
n the local conditions that modify tissue response (e.g., narrow interdental spaces, saddle areas, attachment of frenula, oblique ridges).
factor, erythrocyte-maturation (EMF),
n See vitamin B complex.
factor, etiologic,
n the element or influence that can be assigned as the cause or reason for a disease or lesion.
factor, extrinsic,
n See vitamin B complex.
factor, familial,
n a characteristic derived through heredity.
factor, glass,
n See factor XII.
factor, glucocorticoid,
n See hormone, “S.”
factor, Hageman,
n See factor XII.
factor, Hr,
n blood factors that are reciprocally related to the Rh factors. They are present in agglutinogens when the corresponding Rh factor is absent from the gene.
factor, hyperglycemic,
n See glucagon.
factor, hyperglycemic-glycogenolytic,
n See glucagon.
factor, intrinsic,
n See factor, Castle's intrinsic.
factor, kappa,
n See factor VII.
factor, labile,
n See factor V.
factor, local,
n the limited factors that include dental plaque, bacterial toxins and irritants, calculus, food impaction, and other surface and locally placed irritants that are capable of injuring the periodontium.
factor, pellagra-preventive,
n See acid, nicotinic.
factor, plasma prothrombin conversion (PPCF),
n See factor V.
factor, plasma thromboplastin (PTF),
n the substances with thromboplastic activity contributed by the plasma. Included are the antihemophilic factor, Christmas factor, plasma thromboplastin antecedent, and Hageman factor. See also factor VIII.
factor, plasma thromboplastin, A (PTF-A),
n See factor VIII.
factor, plasma thromboplastin, B (PTF-B),
n See factor IX.
factor, plasma thromboplastin, C (PTF-C),
n See factor XI.
factor, plasma thromboplastin, D (PTF-D),
n this factor is considered by some to be a fourth plasma substance with thromboplastic activity; not well characterized.
factor, plasma, X,
n See factor IX.
factor, platelet,
n a substance on or in the surface of blood platelet necessary for coagulation in the absence of extravascular thromboplastic substances.
factor, platelet, 1,
n either factor V or a factor with factor V activity; absorbed on platelets and accelerates conversion of prothrombin to thrombin.
factor, platelet, 2,
n a substance that accelerates the conversion of fibrinogen to fibrin.
factor, platelet, 3,
n a substance associated with thromboplastin generation activity.
factor, platelet, 4,
n an antiheparin factor.
factor, prothrombin conversion,
n See factor VII.
factor, prothrombin-converting,
n See factor VII.
factor, Prower,
n.pr See factor X.
factor, psychosomatic,
n the psychic, mental, or emotional factors that play a role in determining the initiation, course, and extent of a physical process, either directly or indirectly. Psychosomatic factors have been implicated in bruxism, clenching, and other oral habits.
factor, PTA (plasma thromboplastin antecedent factor),
n See factor XI.
factor, reparative,
n the ability of the tissues to heal or regenerate when they have been subjected to injury or disease.
factor, Rh,
n the agglutinogens of red blood cells responsible for isoimmune reactions such as occur in erythroblastosis fetalis and incompatible blood transfusions.
factor, spreading,
n an enzyme that increases the permeability of ground substance.
factor, stable,
n See factor VII.
factor, Stuart,
n.pr See factor X.
factor, Stuart-Prower,
n.pr See factor X.
factor, third thromboplastic,
n See factor C.
factor X
Coagulation factor X, prothrombase, prothrombinase, Stuart Prower factor Hematology A vitamin K-dependent enzyme which is the key protein in all–intrinsic, extrinsic, common coagulation pathways, converting prothrombin to
thrombin. See Factor X deficiency.
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