The amount of a ubiquinone biosynthesis monooxygenase COQ6, mitochondrial when measured in blood serum. The trait is level of ubiquinone biosynthesis monooxygenase COQ6, mitochondrial in blood serum (Ontology of Biological Attributes term OBA_2041102). Also known as: blood serum ubiquinone biosynthesis monooxygenase COQ6, mitochondrial amount.