An indium-111 preparation comprises a complex of indium-111 with a quinoline compound carrying an 8-hydroxyl group, e.g. oxine, present in an aqueous medium which also contains a surface active agent to prevent the complex from becoming bound to the surface of the vessel on autoclaving, and optionally a buffer to improve blood cell labelling efficiency. The surface active agent is preferably non-ionic, e.g. a polyoxyethylene sorbitan ester of a fatty acid. The buffer is preferably N-2-hydroxyethylpiperazine-N'-2-ethanesulphonic acid.
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