For Research Use Only. Not for Use in Diagnostic Procedures. This BIOPHEN ANTI-Xa (2 Stages heparin Assay) kit is a two-stage chromogenic assay for measuring the activity of heparins (UFH or LMWH), in manual or automatic method. This method is proposed only to test heparin in human citrated plasma, or in purified solution. This kit is for research use only and must not be used from patient diagnosis or treatment. NOTE: This product replaces Ref A221010 and requires separate purchase of specific buffers depending on the analyte being tested and compendia reference desired: Specific buffer needed for UFH Assay, USP or EP: AAR030K. Specific buffers needed for LMWH Assay, USP:AAR005L, AAR029K, AAR028K. Specific buffers for LMWH Assay, EP: AAR005L, AAR029K. USP = United States Pharmacopeia, EP = European Pharmacopeia.. Please see important notification letter from the manufacturer regarding the use of this product.