The amount of a short/branched chain specific acyl-CoA dehydrogenase, mitochondrial when measured in blood serum. The trait is level of short/branched chain specific acyl-CoA dehydrogenase, mitochondrial in blood serum (Ontology of Biological Attributes identifier OBA_2040471). Also known as: blood serum short/branched chain specific acyl-CoA dehydrogenase, mitochondrial amount.