level of bifunctional heparan sulfate N-deacetylase/N-sulfotransferase 1 in blood serum (OBA_2042539) is the amount of a bifunctional heparan sulfate N-deacetylase/N-sulfotransferase 1 when measured in blood serum. Also known as: blood serum bifunctional heparan sulfate N-deacetylase/N-sulfotransferase 1 amount.