blood testosterone amount blood testosterone level EFO:0004908 circulating testosterone level Trait.ontology CMO:0000568 CMO:0000512 The proportion, quantity, or volume in whole blood, serum, or plasma of a potent androgen that promotes development of male secondary sex characteristics and the development of spermatozoa and may regulate sexual desire and help maintain bone and muscle health in both males and females. VT:0005180 blood hormone amount