For Research Use Only. Use in Diagnostic Procedures. Buffer containing Tris (Tris (hydroxymethyl) aminomenthane (0.05M), sodium chloride (0.175M), EDTA (7.5mM), PEG (0.1%), and 0.9g/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.EP = European Pharmacopeia. Please see important notification letter from the manufacturer regarding the use of this product. For in vitro use only. Vials of 20 mL, ready to use. More information about this product here.