The amount of a NADH dehydrogenase [ubiquinone] flavoprotein 2, mitochondrial when measured in blood serum. The trait is level of NADH dehydrogenase [ubiquinone] flavoprotein 2, mitochondrial in blood serum (OBA_2042547). Also known as: blood serum NADH dehydrogenase [ubiquinone] flavoprotein 2, mitochondrial amount.