The amount of a heparan sulfate glucosamine 3-O-sulfotransferase 5 when measured in blood serum. The trait is level of heparan sulfate glucosamine 3-O-sulfotransferase 5 in blood serum (OBA_2041934). Also known as: blood serum heparan sulfate glucosamine 3-O-sulfotransferase 5 amount.