Testosterone

This test is used to determine if your testosterone level is abnormal. This could be used to explain difficulty getting an erection (erectile dysfunction), inability of your partner to get pregnant (infertility), premature or delayed puberty if you are male, or the appearance of masculine physical features if you are female.

PREPARATION FOR TEST

A blood sample is obtained by inserting a needle into a vein in the arm.

NORMAL FINDINGS

  • Free Testosterone: 0.3-2 pg/mL

  • % Free Testosterone: 0.1%-0.3%

Total Testosterone:

  • 7 mos-9 yrs (Tanner Stage I)

  • Male: Less than 30 ng/dL

  • Female: Less than 30 ng/dL

  • 10-13 yrs (Tanner Stage II)

  • Male: Less than 300 ng/dL

  • Female: Less than 40 ng/dL

  • 14-15 yrs (Tanner Stage III)

  • Male: 170-540 ng/dL

  • Female: Less than 60 ng/dL

  • 16-19 yrs (Tanner Stage IV, V)

  • Male: 250-910 ng/dL

  • Female: Less than 70 ng/dL

  • 20 yrs and over

  • Male: 280-1080 ng/dL

  • Female: Less than 70 ng/dL

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.