blood hormone amount ATOL:0000527 CMO:0003030 CMO:0003032 EFO:0004730 EFO:0004769 EFO:0007972 EFO:0008391 EFO:0010245 EFO:0020363 EFO:0020621 The proportion, quantity, or volume in whole blood, serum, or plasma of any of the chemical substances that have specific regulatory effects on the activity of a certain organ or organs; originally applied to substances secreted by various endocrine glands and transported in the bloodstream to the target organs, it is sometimes extended to include substances that are not produced by the endocrine glands but that have similar effects. Trait.ontology VT:0005418 blood hormone content circulating hormone level blood molecular composition trait