The amount of a succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial when measured in blood serum. The trait is Ontology of Biological Attributes entry OBA_2043415 (level of succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial in blood serum). Also known as: blood serum succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial amount.