The present invention aims at providing an antibody, by which metastin or
its derivative can be quantified specifically with a high sensitivity, a
method of detecting/quantifying metastin or its derivative using the
antibody, and a diagnostic agent (e.g., a diagnostic for pregnancy) the
same.Specifically, an antibody capable of specifically reacting with a
partial peptide at the N-terminus or C-terminus of a polypeptide having
the amino acid sequence represented by SEQ ID NO: 1 or its derivative,
and a method of detecting/quantifying metastin or its derivative using
the antibody as well as a diagnostic agent using the same.