The amount of a medium-chain acyl-CoA ligase ACSF2, mitochondrial when measured in blood serum. The trait is Ontology of Biological Attributes term OBA_2040487 (level of medium-chain acyl-CoA ligase ACSF2, mitochondrial in blood serum). Also known as: blood serum medium-chain acyl-CoA ligase ACSF2, mitochondrial amount.