This item MFG by HYPHEN BioMed and Dis. by Aniara Diagnostics. Normal human plasma with Rivaroxaban, lyophilized. 3 levels from 0 to about 100 ng/mL. Use with chromogenic anti-Xa assays. Concentrations established against reference preparation with BIOPHEN DiXal (A221030-RUO). 4x3x1 mL vials.