The amount of a 2',3'-cyclic-nucleotide 3'-phosphodiesterase when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2041069 (level of 2',3'-cyclic-nucleotide 3'-phosphodiesterase in blood serum). Also known as: blood serum 2',3'-cyclic-nucleotide 3'-phosphodiesterase amount.