The amount of a lipoamide acyltransferase component of branched-chain alpha-keto acid dehydrogenase complex, mitochondrial when measured in blood serum. The trait is level of lipoamide acyltransferase component of branched-chain alpha-keto acid dehydrogenase complex, mitochondrial in blood serum (OBA_2041236). Also known as: blood serum lipoamide acyltransferase component of branched-chain alpha-keto acid dehydrogenase complex, mitochondrial amount.