Antibodies are often generated from hybridoma cell lines and supplied in tissue culture supernatant (TCS). TCS itself contains many substances that interfere with antibody labeling reactions. Successful labeling therefore requires antibodies to be purified prior to labeling. The AbSelect TCS system is a fast and simple method to purify these antibodies. AbSelect TCS is prepared by coupling highly purified protein A to agarose beads which can be used to purify IgG fractions from hybridoma supernatants. The method involves the capture of the antibody on the AbSelect TCS resin and the removal of unwanted substances using a simple wash procedure. The purified product is then eluted and neutralized.