blood testosterone amount CMO:0000512 CMO:0000568 EFO:0004908 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. Trait.ontology VT:0005180 blood testosterone level circulating testosterone level blood hormone amount