A testosterone test measures the amount of the male hormone, testosterone, in the blood. Both men and women produce this hormone.
The test described in this article measures the total amount of testosterone in the blood. Another test measures what is called "free" testosterone.
How the test is performed
A blood sample is needed. For information on how this is done, see: Venipuncture
The recommended time of day to have a blood sample taken for this test is between 7 a.m. and 10 a.m. It may need to be repeated a second time.
How to prepare for the test
The health care provider may advise you to stop taking drugs that may affect the test.
How the test will feel
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed
This test may be done if you have symptoms of abnormal male hormone (androgen) production.
In males, the testicles produce most of the testosterone in the body. Levels are most often checked to evaluate signs of low testosterone:
- In boys -- early or late puberty
- In men -- impotence, low level of sexual interest, infertility, thinning of the bones
In females, the ovaries produce most of the testosterone. Levels are most often checked to evaluate signs of higher testosterone levels, such as:
- Decreased breast size
- Excess hair growth
- Increased size of the clitoris
- Irregular or absent menstrual periods
- Male-pattern baldness or hair thinning
- Male: 300 -1,000 ng/dL
- Female: 15 - 70 ng/dL
Note: ng/dL = nanograms per deciliter
The examples above are common measurements for results for these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different specimens.Talk to your doctor about the meaning of your specific test results.
What abnormal results mean
Increased testosterone levels may mean:
- Androgen resistance (resistance to the action of male hormones)
- Cancer of the ovaries
- Cancer of the testes
- Congenital adrenal hyperplasia
- Early (premature) start to puberty
Decreased production of testosterone:
- Chronic illness
- Condition in which the pituitary gland does not produce normal amounts of some or all of its hormones
- Delayed puberty
- Failure of the testicles
- Noncancerous tumor of the pituitary cells that produces too much of the hormone prolactin
What the risks are
Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight, but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
Swerdloff RS, Wang C. The testis and male sexual function. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 242.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. ©1997-2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
Sign Up for Free Newsletters
Ask Your Doctor the RIGHT Questions!
the most from your doctor visit.
Emailed right to you!
The Ask Your Doctor email series
may contain sponsored content.
18+, US residents only please.
Explore Original Articles About...
Get the MOST from QualityHealth
- Top Searches
- 1. Arthritis Management: Nature Heals
- 2. 5 Digestive To-Dos
- 3. Men: Should You Shave It or Leave It?
- 4. Today's Top Fitness Trends
- 5. Sugar and Osteoarthritis : The Link
- 6. Can't Afford Your Hospital Bills?
- 7. Stay Energized All Day Long
- 8. Phobias: Who Has Them and Why?
- 9. What If Your EpiPen Fails?
- 10. 5 Costly Medical Billing Mistakes
- 1. Ice Falls Can Cause Serious Injuries
- 2. Can Inactivity Act Like a Disease?
- 3. Kale Snack Recipe for Diabetics
- 4. How Running Affects Arthritis
- 5. Sugar and Your Immunity System
- 6. Do Weight Loss Supplements Work?
- 7. 5 Super Foods for Spring
- 8. The Hazards of Reusable Bags
- 9. How to Avoid Ingrown Hairs
- 10. Health Tip: Constantly Change Shoes
- 1. 4 Common Treatments for Epilepsy
- 2. What Does a Urogynecologist Do?
- 3. GERD Without Heartburn? It's Possible
- 4. Graston Technique: Can It Work on You?
- 5. Music Therapy Can Help Autism
- 6. 8 Ways to Fight MS-Related Fatigue
- 7. Can You Still Bleed After Menopause?
- 8. Be Your Own Health Care Advocate
- 9. Why Is Syphillis on the Rise?
- 10. Ideal Weight vs. Happy Weight
The material on the QualityHealth Web site is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a physician or other qualified health provider. See additional information.