Specific for human transferrin complex between transferrin and soluble transferrin receptor. Can be used for detection of transferrin in serum by sandwich immunoassay, for detection of transferrin - transferrin receptor complex by sandwich ELISA, recommended pairs for transferrin detection by sandwich immunoassay (coating - conjugate): 8B9 - 11D3. Recommended pair for transferrin-transferrin receptor complex detection by sandwich ELISA (coating - conjugate): 23D10 - 8B9, 23D10 (Hytest cat.No # 4Tr26) - 11D3