In MALES, blood for testosterone measurement should be collected as an early morning specimen, between 6 and 9 am. Only serum can be used.
GENERAL NOTES
APPLICATION: Assessment of hirsutism or virilisation in females; investigation of testicular failure or precocious puberty in males.
INTERPRETATION: Increased levels may be found in women with hirsutism or virilisation and in (phenotypic) women with total androgen insensitivity. Levels are increased in males with precocious puberty. Decreased levels are found in males with testicular failure, either primary or secondary to hypopituitarism.