Abstract: The disclosure describes immunoassay methods for measurements of concentrations of related analytes in samples of body fluids from different mammalian species. More particularly, the disclosure describes reagents and methods that may be used for assays of a mammalian antigen across a range of different mammalian species, using immunological reagents based on non-mammalian antibodies the mammalian antigen. In addition, a calibrator or a set of calibrators are described that are assigned with concentration values for the antigen for each of the different mammalian species.

Abstract: The present invention relates to immunoassay methods for measurements of concentrations of related analytes in samples of body fluids from different mammalian species. More particularly, it provides reagents and methods that may be used for assays of a mammalian antigen across a range of different mammalian species, using immunological reagents based on non-mammalian antibodies towards said mammalian antigen. Moreover, a calibrator or a set of calibrators is provided, assigned with concentration values for the said antigen for each of the different mammalian species. The advantage of this invention is that the analytical laboratories or veterinarians may use the same reagents and method to test a plurality of different mammalian species without having to use different immunoassay reagents for different mammalian species.