» Indium In 111 Chloride Solution is a sterile, nonpyrogenic solution of radioactive indium (¹¹¹In) in dilute hydrochloric acid suitable for the radiolabeling of proteins such as monoclonal antibodies, peptides, or small biologically active organic molecules. The concentration of acid and ¹¹¹In per mL of Indium In 111 Chloride Solution may require adjustment for the specific antibody or peptide being labeled. It contains not less than 90.0 percent and not more than 110.0 percent of the labeled amount of ¹¹¹In expressed as megabecquerels (or millicuries) per mL at the time indicated in the labeling. Other chemical forms of radioactivity do not exceed 10.0 percent of the total radioactivity.