A compound attribute that is the ratio of amount of fatty acid-binding protein 5 (human) in blood to amount of phosphopantothenoylcysteine decarboxylase (human) in blood. The trait is FABP5/PPCDC protein level ratio in blood (OBA_2055436, an Ontology of Biological Attributes term). Also known as: the ratio of amount of fatty acid-binding protein 5 (human) in blood to amount of phosphopantothenoylcysteine decarboxylase (human) in blood.