abnormal circulating noradrenaline level increased circulating noradrenaline level MP:0005665 MPheno.ontology greater than the normal blood amount of the hormone secreted by the adrenal medulla and acts as a neurotransmitter in the sympathetic peripheral nervous system and in some tracts of the CNS; noradrenaline is the demethylated biosynthetic precursor of epinephrine increased circulating norepinephrine level increased noradrenaline level