The amount of a S-adenosylmethionine sensor upstream of mTORC1 when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2044882 (level of S-adenosylmethionine sensor upstream of mTORC1 in blood serum). Also known as: blood serum S-adenosylmethionine sensor upstream of mTORC1 amount.