blood pituitary hormone amount blood growth hormone amount serum levels of pituitary growth hormone serum levels of GH CMO:0001228 blood growth hormone level serum levels of growth hormone The proportion, quantity, or volume in whole blood, serum, or plasma of the hormone that promotes body growth, fat mobilization, and inhibition of glucose utilization. serum levels of somatotropic hormone serum levels of somatropin circulating growth hormone level Trait.ontology VT:0005120