The amount of a signal peptide, CUB and EGF-like domain-containing protein 1 when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2043410 (level of signal peptide, CUB and EGF-like domain-containing protein 1 in blood serum). Also known as: blood serum signal peptide, CUB and EGF-like domain-containing protein 1 amount.