Chromogranin
A, ELISA 
Human Chromogranin A EIA Kit
Chromogranin A in sample inhibits the maximal binding of biotin-labeled Chromogranin A to rabbit anti-Chromogranin A antibody. Chromogranin A/Chromogranin A complexes are captured by immobilized goat anti-rabbit Ig. Levels of captured Chromogranin A-biotin/anti-Chromogranin A complexes are quantitated by addition of Streptavidin-labeled-peroxidase and peroxidase substrate OPD. |