Shop Marlen Manufacturing, 1-1/2 to 3 Inch Stoma, Oval, Antimicrobial Susceptibility Testing Disc, 15.38", For Calibration of the Alinity i Analyzers when used for the Semi-quantitative Determination of the IgG class of Autoantibodies specific to Cyclic Citrullinated Peptide in Human Serum or Plasma