The amount of a oxygen-dependent coproporphyrinogen-III oxidase, mitochondrial when measured in blood serum. The trait is level of oxygen-dependent coproporphyrinogen-III oxidase, mitochondrial in blood serum (OBA_2041125, an Ontology of Biological Attributes entry). Also known as: blood serum oxygen-dependent coproporphyrinogen-III oxidase, mitochondrial amount.