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Innovance vwf ac

Manufactured by Siemens
Sourced in Germany

The Innovance VWF:Ac is a laboratory equipment product from Siemens. It is designed to measure the activity of von Willebrand factor (VWF), a key component in the blood clotting process. The core function of this device is to provide accurate and reliable VWF activity measurements for clinical diagnostic purposes.

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6 protocols using innovance vwf ac

1

Serum Biomarkers in Patient Evaluation

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Patient serum was drawn on day 1, 4 and 7 to measure angiotensin II, cortisone, cortisol and aldosterone levels. Patient citrated plasma was used to measure VWF and D-Dimer. All assays were performed according to the manufacturer’s instructions. Concentrations were calculated against standard curves and used for statistical analysis. Blood glucose was measured by glucometer (Glucocare Sense, RMD Mediaids ltd, Haryana, India) and sodium, urea and potassium were measured as part of routine clinical care.
The circulating blood biomarkers were assayed using the following kits: Angiotensin II Enzyme-linked Immunosorbent Assay (ELISA) (E13652287, Sincere Biotech Co.,Ltd, New Taipei City 221, Taiwan (R.O.C.)); Cortisone ELISA (E13652408, Sincere Biotech Co.,Ltd, Sincere Biotech Co.,Ltd, New Taipei City 221, Taiwan (R.O.C.)); Architect Cortisol chemiluminescent microparticle immunoassay (CMIA) (8D15-25, Abbott Laboratories, Abbott Park, Illinois, USA); Liaison Aldosterone chemiluminescent immunoassay (CLIA) (310,450, DiaSorin, Sallugia, Italy); Innovance VWF:Ac (10,487,040/OPHL03, Siemens Healthcare Diagnostics, Marburg, Germany); and Tina-quant D-Dimer Gen.2 particle-enhanced immunoturbidimetric assay (04,912,551, Roche Diagnostics GmbH, Mannheim, Germany).
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2

VWF Activity Quantification Assay

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VWF activity via GpIb binding was measured on an automated instrument (BCS® XP, Siemens AG, Munich, Germany) using a commercial assay kit (Innovance® VWF Ac, Siemens AG, Munich, Germany) with minor modifications. The product-specific in-house reference standard was calibrated versus NIBSC code 09/182.29 (link) The LLOQ of the assay was 19 IU/dL.
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3

Venous Blood Sampling and Biomarker Analysis

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Within the following 24 h after admission, venous blood samples were drawn from all patients and centrifuged at 1200 × g for 15 min within 2 h of collection and subsequently stored at −80°C for further analysis. VWF activity (Innovance VWFAc, Siemens, Spain), MMP-10 levels (R&D Systems, USA), and TAFI activity (TAFIa, STA STACHROM TAFI, Stago, France) were measured with an automated ELISA analyzer TRITURUS (Grifols, Spain) in citrated plasma samples after being thawed on ice and thoroughly vortexed. The detection limit of the assays was 2.2%, 15.1 pg/ml, and 5% for VWFAc, MMP-10, and TAFIa, respectively. All experiments were performed and analyzed in a blinded manner.
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4

Measuring VWF and FVIII in Hemostasis

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The VWF antigen (VWF:Ag, Liatest-VWF:Ag, Diagnostica Stago, France), factor VIII coagulant activity (FVIII:C) by a one-stage, clot-based assay (STA-ImmunoDef VIII, STA-C.K.Prest, Diagnostica Stago, France) and VWF activity [13] measured as VWF binding to the glycoprotein Ib (GPIb) receptor on the platelet surface (Innovance® VWF:Ac, Siemens Healthcare Diagnostics, ISTH nomenclature VWF:GPIbM) were measured on STA-R Evolution analyser (Diagnostica Stago, France) using commercial kits.
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5

Measuring VWF and ADAMTS13 Activities

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Laboratory measurements are described in detail in the Supplementary material online. VWF factor activity (Innovance VWF Ac) was determined on a Behring Coagulation System according to protocols from the manufacturer (Siemens Healthcare Diagnostics, Marburg, Germany). ADAMTS13 activity was determined as described earlier.20 (link) VWF antigen and VWF propeptide levels were measured by ELISA using commercial antibodies (DAKO, Denmark and Sanquin, The Netherlands, respectively). Data are presented in percentage activity or percentage of antigen. The reference value is derived from normal pooled plasma. Our pool is composed of >200 healthy volunteers. D-dimer levels were determined with a particle-enhanced immunoturbidimetric assay (Innovance D-dimer, Siemens Healthcare Diagnostics). Fibrinogen concentration was derived from the change in optical signal during prothrombin time determination. Fibrinogen antigen was determined by ELISA using antibodies from DAKO (Glostrup, Denmark). The ability of rADAMTS13 to cleave porcine VWF was determined in vitro by measuring porcine VWF activity in plasma of animals before and after addition of rADAMTS13.
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6

VWF Activity Quantification Protocol

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VWF activity was quantified in the central laboratory of the University Hospital in Freiburg using the INNOVANCE® VWF Ac (Siemens Healthineers, Germany) on a Sysmex CS5100 analyzer.
In addition, analysis of VWF antigen, VWF collagen binding capacity (VWF:CB) and VWF multimeric analysis were performed as previously described [21 (link)].
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