The amount of a 2-methoxy-6-polyprenyl-1,4-benzoquinol methylase, mitochondrial when measured in blood serum. The trait is level of 2-methoxy-6-polyprenyl-1,4-benzoquinol methylase, mitochondrial in blood serum (OBA_2041101, an Ontology of Biological Attributes term). Also known as: blood serum 2-methoxy-6-polyprenyl-1,4-benzoquinol methylase, mitochondrial amount.