A method is disclosed for extraction, concentration, and bioassay measurement of the concentration of bioactive parathyroid peptides in biological or other fluids. Parathyroid peptides are extracted from the fluid by a support-antibody matrix specific to the N-terminal region. The bioassay is directed...http://www.google.es/patents/US4508828?utm_source=gb-gplus-sharePatente US4508828 - Bioassay of parathyroid hormone
