The amount of a short/branched chain specific acyl-CoA dehydrogenase, mitochondrial when measured in blood. The trait is level of short/branched chain specific acyl-CoA dehydrogenase, mitochondrial in blood (OBA_2050469, an Ontology of Biological Attributes entry). Also known as: blood short/branched chain specific acyl-CoA dehydrogenase, mitochondrial amount.