In US: For Research Use Only. Not for Use In Diagnostic Procedures. Lyophilized plasmas, at defined Apixaban concentrations (3 levels of about 0 to 600 ng/mL), as measured with BIOPHEN™ DiXal (Ref A221030-RUO) or BIOPHEN™ Heparin LRT (Ref A221011-RUO, A221013-RUO and A221015-RUO), for the calibration of Apixaban measurements using anti-Xa chromogenic assays.