For Research Use Only. Not for Use in Diagnostic Procedures. Buffer containing Tris (Tris (hydroxymethyl) aminomenthane (6.1g/L), Sodium Chloride (8.77 g/L) and 0.9 g/L Sodium Azide (as preservative). Can be used as buffer recommended by the USP for the assay of heparin anti-IIa and anti-Xa activity verified and validated in combination with BIOPHEN ANTI-IIa (2 Stages heparin Assay) and BIOPHEN ANTI-Xa (2 Stages Heparin Assay) kits. USP = United States Pharmacopeia. Please see important notification letter from the manufacturer regarding the use of this product. For Research Use Only. Not for Use in Diagnostic Procedures. Available online.