The amount of a 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 1 when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2042851 (level of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 1 in blood serum). Also known as: blood serum 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 1 amount.