level of Kazal-type serine protease inhibitor domain-containing protein 1 in blood serum (OBA_2042084, an Ontology of Biological Attributes identifier) is the amount of a Kazal-type serine protease inhibitor domain-containing protein 1 when measured in blood serum. Also known as: blood serum Kazal-type serine protease inhibitor domain-containing protein 1 amount.