The amount of a [pyruvate dehydrogenase (acetyl-transferring)] kinase isozyme 2, mitochondrial when measured in blood serum. The trait is level of [pyruvate dehydrogenase (acetyl-transferring)] kinase isozyme 2, mitochondrial in blood serum (Ontology of Biological Attributes entry OBA_2042832). Also known as: blood serum [pyruvate dehydrogenase (acetyl-transferring)] kinase isozyme 2, mitochondrial amount.