blood interleukin-1 amount blood interleukin-1 beta amount VT:0008640 circulating interleukin-1 beta level The proportion, quantity, or volume in whole blood, serum, or plasma of an interleukin-1 subtype that is synthesized as an inactive membrane-bound pro-protein on monocytes, macrophages and other cells; proteolytic processing of the precursor form by caspase 1 results in release of the active form of interleukin-1beta from the membrane. interleukin-1 beta measurement circulating Il1b level circulating IL-1b level Trait.ontology circulating IL-1 beta level circulating catabloin level EFO:0004812