The amount of a NADH dehydrogenase [ubiquinone] iron-sulfur protein 6, mitochondrial when measured in blood. The trait is level of NADH dehydrogenase [ubiquinone] iron-sulfur protein 6, mitochondrial in blood (OBA_2051565). Also known as: blood NADH dehydrogenase [ubiquinone] iron-sulfur protein 6, mitochondrial amount.