blood bilirubin level serum total bilirubin level mshimoyama 2010-12-13T11:30:05Z bilirubin measurement VT:0001569 clinical_measurement_ontology CMO:0000376 The complete or entire amount of bilirubin in a specified volume of serum, the clear liquid that separates from blood after it has clotted completely, i.e. blood plasma from which fibrinogen has been removed. Bilirubin is the bile pigment produced by breakdown of heme and reduction of biliverdin. EFO:0004570