INTENDED USE An enzyme-linked immunosorbent assay (ELISA) for the quantitative d
INTENDED USE An enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of Von Willebrand Factor Activity (VWF:Act) in citrated human plasma. For In Vitro Diagnostic Use.SUMMARY OF THE TEST Von Willebrand Factor Antigen (VWF:Ag or Factor VIII-related protein) is a plasma protein found in circulation combined by non-covalent interactions with Factor VIII (FVIII:C), a pro-coagulant protein also known as the anti-hemophilic factor. Deficiency of FVIII causes classic hemophilia while deficiency of VWF causes von Willebrand disease. Von Willebrand Disease is characterized by a deficiency or defect of VWF. Greater than 70% of Von Willebrand disease patients have a type 1 deficiency while approximately 20% have a type II deficiency. The laboratory diagnosis of Von Willebrand disease may require both quantitative and qualitative (functional) determinations to differentiate the two predominant subtypes of the disease, type I and type II. The classification of Von Willebrand disease into subtypes is important in determining the course of clinical treatment. PRINCIPLE OF THE TEST The REAADS VWF:Act assay is a sandwich ELISA. A monoclonal capture antibody specific for the portion of VWF which binds platelets is coated to 96-microwell polystyrene plates. Diluted patient plasma is incubated in the wells. The plates are washed to remove unbound proteins and other plasma molecules. Bound antigen is quantitated using horseradish peroxidase (HRP) conjugated anti-human VWF detection antibody. Following incubation, unbound conjugate is removed by washing. A chromogenic substrate of tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) is added to develop a colored reaction. The intensity of the color is measured in O.D. units with a spectrophotometer at 450 nm. Patient VWF:Act in relative percent concentration is determined against a curve made from the reference plasma provided with the kit. Refer to Product Package Insert.
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative de
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of Von WillebrandFactor Antigen (VWF: Ag) in citrated human plasma. For In Vitro Diagnostic Use.SUMMARY THE TESTVon Willebrand Factor Antigen (VWF:Ag or Factor VIII-related protein) is a plasma protein found incirculation combined by non-covalent interactions with Factor VIII (FVIII:C), a pro-coagulant protein alsoknown as the anti-hemophilic factor. These two proteins show distinct biochemical and functionalproperties as well as different antigenic determinants; their plasma levels may vary independently ofeach other. Deficiency of FVIII causes classic hemophilia while deficiency of VWF causes VonWillebrand disease. VWF:Ag plays a very important role in hemostasis. The prevalence of Von Willebrand disease has been estimated to be 1-3% of thegeneral population. Approximately 80% of Von Willebrand disease patients have a type I deficiency.The laboratory diagnosis of Von Willebrand disease may require both quantitative and qualitative(functional) determinations.PRINCIPLE OF THE TESTREAADS VWF:Ag assay is a sandwich ELISA. A capture antibody specific for human VWF is coated to96-microwell polystyrene plates. Diluted patient plasma is incubated in the wells, allowing any availableVWF:Ag to bind to the anti-human VWF antibody on the microwell surface. The plates are washed toremove unbound proteins and other plasma molecules. Bound VWF:Ag is quantitated using horseradishperoxidase (HRP) conjugated anti-human VWF detection antibody. Following incubation, unboundconjugate is removed by washing. A chromogenic substrate of tetramethylbenzidine (TMB) and hydrogenperoxide (H2O2) is added to develop a colored reaction. The intensity of the color is measured in opticaldensity (O.D.) units with a spectrophotometer at 450nm. Patient VWF:Ag in relative percentconcentration is determined against a curve made from the reference plasma provided with the kit. Refer to product package insert.
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative de
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of Protein C Antigen in citrated human plasma. For In Vitro Diagnostic Use.SUMMARY AND EXPLANATION OF THE TESTProtein C deficiency, either congenital or acquired, may lead to serious thrombotic events such as thrombophlebitis, deep vein thrombosis, or pulmonary embolism. Patients with a congenital heterozygous deficiency may present with venous thrombosis in young adulthood, while patients with the rare homozygous deficiency present with massive thrombosis (purpura fulminans) during the neonatal period. The prevalence of Protein C deficiency in the general population has been estimated at 1 in 300. In younger patients (<40-45 years) with recurrent venous thrombosis, the frequency of Protein C deficiencies may be as high as 10 to 15%. A decreased Protein C activity in plasma may be the result of low concentrations and function (type I) or only low function (type II).PRINCIPLE OF THE TESTThe Protein C Antigen assay is a sandwich ELISA. A capture antibody specific for human Protein C is coated to 96-microwell polystyrene plates. Diluted patient plasma is incubated in the wells, allowing any available Protein C to bind to the anti-human Protein C antibody on the microwell surface. The plates are washed to remove unbound proteins and other plasma molecules. Bound Protein C is quantitated using horseradish peroxidase (HRP) conjugated anti-human Protein C detection antibody. Following incubation, unbound conjugate is removed by washing. A chromogenic substrate of tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) is added to develop a colored reaction. The intensity of the color is measured in optical density (O.D.) units with a spectrophotometer at 450nm. Protein C Antigen relative percent concentrations in patient plasma are determined against a curve prepared from the reference plasma provided with the kit.Refer to Product Package Insert.
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative de
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of Free Protein S Antigen in citrated human plasma. For In Vitro Diagnostic Use.SUMMARY AND EXPLANATION OF THE PROTEIN S TESTProtein S is a vitamin K-dependent protein synthesized in the liver, vascular endothelium, and megakaryocytes, which plays an important physiologic role in the Protein C Anticoagulant System. This anticoagulant system is one of the major regulators of hemostasis by inhibiting clot formation and by promoting fibrinolysis. Protein S functions as a cofactor for activated Protein C on the vascular membrane to facilitate the degradation of clotting factors Va and VIIIa, down-regulating clot formation. In normal plasma approximately 40% of Protein S circulates as a free molecule, while 60% is complexed with C4b, a plasma protein of the classical complement pathway. Only Free Protein S is functionally active and able to bind to activated Protein C, while the complexed form of Protein S is not.Protein S deficiency, either congenital or acquired, may lead to serious thrombotic events such as thrombophlebitis, deep vein thrombosis, or pulmonary embolism. The prevalence of Protein S deficiency has been estimated to be less than 1 case per 300 in the general population. Two-thirds of patients with a congenital deficiency of Protein S (levels less than 50% of normal) may present with venous thrombosis in young adulthood. In young patients (<35 years) with a history of thrombosis, the prevalence may be as high as 15 to 18%. Acquired Protein S deficiency may be seen during pregnancy, oral contraceptive or oral anticoagulant therapy, liver disease, diabetes mellitus, postoperative complications, septicemia, and various inflammatory syndromes. A decreased Protein S activity in plasma may be the result of low concentrations or abnormal function of the Protein S molecule.Refer to Product Package Insert.
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative de
INTENDED USEAn enzyme-linked immunosorbent assay (ELISA) for the quantitative determination of Total and Free Protein S Antigen in citrated human plasma. For In Vitro Diagnostic Use.SUMMARY AND EXPLANATION OF THE PROTEIN S TESTProtein S is a vitamin K-dependent protein synthesized in the liver, vascular endothelium, and megakaryocytes, which plays an important physiologic role in the Protein C Anticoagulant System. This anticoagulant system is one of the major regulators of hemostasis by inhibiting clot formation and by promoting fibrinolysis. Protein S functions as a cofactor for activated Protein C on the vascular membrane to facilitate the degradation of clotting factors Va and VIIIa, downregulating clot formation. In normal plasma approximately 40% of Protein S circulates as a free molecule, while 60% is complexed with C4b, a plasma protein of the classical complement pathway. Only Free Protein S is functionally active and able to bind to activated Protein C, while the complexed form of Protein S is not.Protein S deficiency, either congenital or acquired, may lead to serious thrombotic events such as thrombophlebitis, deep vein thrombosis, or pulmonary embolism. The prevalence of Protein S deficiency has been estimated to be less than 1 case per 300 in the general population. Two-thirds of patients with a congenital deficiency of Protein S (levels less than 50% of normal) may present with venous thrombosis in young adulthood. In young patients (<35 years) with a history of thrombosis, the prevalence may be as high as 15 to 18%.7 Acquired Protein S deficiency may be seen during pregnancy, oral contraceptive or oral anticoagulant therapy, liver disease, diabetes mellitus, postoperative complications, septicemia and various inflammatory syndromes.8 A decreased Protein S activity in plasma may be the result of low concentrations or abnormal function of the Protein S molecule.Refer to Product Package Insert.