Specific Protein Calibrator. This new material is liquid ready to use (2-8*C), has open vial stability of 30 days, & all values are traceable to Reference Standards. It can be used for Linearity Verification of 13 specific protein analytes such as: Anti Streptolysin O (ASO), Ceruloplasmin, Complement C3, Complement C4, CRP, Ferritin, Haptoglobin, IgA, IgG, IgM, Prealbumin, Rheumatoid Factor (RF), Transferrin