Calibrators for CalproGold assay. Calibrators are made of purified native calprotecin, and come ready-to-use in dilutions "blank" up to approx. 850 mg/kg. The calibrators are made of native human calprotectin derived from blood products and diluted into ready-to-use solutions. The solution has been screened for HIV-1 and HIV-2 antibodies, as well as αHCV antibodies and HBsAg.