The present invention concerns an immunological test for determining
NT-proBNP comprising at least two antibodies to NT-proBNP, wherein at
least one of the antibodies to NT-proBNP is a monoclonal antibody. One of
these antibodies is directed at least against parts of the epitope of
NT-proBNP comprising the amino acids 38 to 50. In addition, one of these
antibodies is directed at least against parts of the epitope of NT-proBNP
comprising the amino acids 1 to 37 or 43 to 76. The epitope recognized by
the antibodies can slightly overlap.