Human vWF Calibrator is lyophilized. It is intended for use as an assay calibrator for MSD U-PLEX human assays that measure vWF. The utility of this product has not been evaluated in other applications. The concentration of vWF is provided in the lot-specific certificate of analysis. Human vWF was purified from human plasma. Instructions on using Human vWF Calibrator are provided in U-PLEX Biomarker Group 3 Human Product Inserts.