Analytical Performance of a New Immunoturbidimetric Assay for von Willebrand Factor (VWF) Activity Testing.
Clin Lab
; 65(4)2019 Apr 01.
Article
en En
| MEDLINE
| ID: mdl-30969088
ABSTRACT
BACKGROUND:
Von Willebrand disease requires laboratory confirmation with quantitative and qualitative measurements of von Willebrand factor (VWF). Qualitative VWF-activity (VWF-Ac) tests have poor inter- and intra-laboratory reproducibility with coefficients of variation (CVs) as high as 64%, often lacking accuracy at low VWF-Ac levels.METHODS:
This study evaluated the recently launched immunoturbidometric STAGO® STA-VWFRCo® reagent for VWF-Ac. Accuracy was evaluated on 32 samples by comparing results using the Siemens® Innovance® reagent. An intra-run reproducibility study was performed on controls. Linearity and lower limit of detection was studied on external-quality-assurance (EQA) material with a known VWF-Ac level.RESULTS:
STA-VWFRCo® reagent results were within clinical interpretation agreement with Siemens® Innovance®. The reproducibility study yielded % CVs of 8.41 for normal and 11.46 for abnormal controls and the assay was linear between 73 and 14.6% and remained linear to 2% with extrapolation.CONCLUSIONS:
The STAGO® STA-VWFRCo® reagent showed clinically meaningful accuracy and acceptable precision.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Enfermedades de von Willebrand
/
Pruebas de Coagulación Sanguínea
/
Factor de von Willebrand
/
Técnicas de Laboratorio Clínico
/
Inmunoturbidimetría
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
/
Qualitative_research
Límite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
Clin Lab
Asunto de la revista:
TECNICAS E PROCEDIMENTOS DE LABORATORIO
Año:
2019
Tipo del documento:
Article