A compound attribute that is the ratio of amount of lysosomal phospholipase A and acyltransferase (human) in blood to amount of sphingomyelin phosphodiesterase (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054024 (PLA2G15/SMPD1 protein level ratio in blood). Also known as: the ratio of amount of lysosomal phospholipase A and acyltransferase (human) in blood to amount of sphingomyelin phosphodiesterase (human) in blood.