Taking medicines that raise
prolactin levels, such as certain seizure
What To Think About
Most of the testosterone in the blood is bound to a protein
called sex hormone binding globulin (SHBG). "Free" testosterone may be checked
when conditions that can increase SHBG levels, such as obesity or
hyperthyroidism, are present.
The levels of other hormones made by the pituitary gland, such as
follicle-stimulating hormone (FSH) and
luteinizing hormone (LH), may be checked to see
whether a low testosterone level is caused by problems with the testicles or
ovaries or the pituitary gland. A really high level of
LH and a low level of testosterone often means that the testicles or ovaries
are not working properly. A low LH level and a really low or high testosterone
level may mean a problem with the pituitary gland. For more information, see the topics
and Luteinizing Hormone.
For women, medicines such as birth control pills or
corticosteroids may lower levels of testosterone. Oral estrogens used for
hormone replacement therapy can also lower
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis:
Fischbach FT, Dunning MB III, eds. (2009).
Manual of Laboratory and Diagnostic Tests, 8th ed.
Philadelphia: Lippincott Williams and Wilkins.
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.