Human CA19-9 (Carbohydrate Antigen 19-9) ELISA kit

This kit applies sandwich ELISA method for the quantitative detection of CA19-9 (Carbohydrate Antigen 19-9) in human samples. The microtiter plate provided in this kit has been pre-coated with an antibody specific to Human CA19-9. Standards or samples are added to the appropriate microtiter plate wells then with a biotin-conjugated antibody specific to Human CA19-9. Next, Avidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After TMB substrate solution is added, only those wells that contain Human CA19-9, biotin-conjugated antibody and enzyme-conjugated Avidin will exhibit a change in color. The enzyme-substrate reaction is terminated by the addition of sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450nm ±10nm. The concentration of Human CA19-9 in the samples is then determined by comparing the OD of the samples to the standard curve.