The amount of a dual specificity calcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1B when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2042819 (level of dual specificity calcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1B in blood serum). Also known as: blood serum dual specificity calcium/calmodulin-dependent 3',5'-cyclic nucleotide phosphodiesterase 1B amount.