The amount of a dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial when measured in blood serum. The trait is level of dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial in blood serum (OBA_2041307). Also known as: blood serum dihydrolipoyllysine-residue acetyltransferase component of pyruvate dehydrogenase complex, mitochondrial amount.