The condition of reagents used in IHC methods should have the highest integrity for optimal staining results. IHC reagents should be fresh and not outdated. Reagents can be purchased prepared or in single chemical packages for mixing before use. Whether the reagents are purchased or mixed in the laboratory, they should be of the highest quality possible.
Repeating IHC due to poor quality reagents is expensive in both direct cost and personnel hours. Reagents, if not fresh or made correctly, can significantly alter the attachment of the antibody to the antigen. Inappropriately prepared, managed, or concentrated wash reagents may dilute antibodies, complexes, and chromogens to false-negative staining, increased background, and possibly non-specific staining.
