Lab

Free Testosterone

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Free Testosterone, Bioavailable Testosterone, Serum Free Testosterone

  • See Also
  1. Total Testosterone
  2. Androgen Decline in the Aging Male
  3. Testicular Failure
  4. Hypogonadism
  • Indications
  1. Total Testosterone decreased
  2. Altered sex-Hormone binding globulin (SHBG)
    1. Low SHBG
      1. Obesity
      2. Type II Diabetes
      3. Hypothyroidism
    2. High SHBG
      1. Older age patient
  • Labs
  • Normal Levels
  1. Male: 100 to 680 pg/ml
  2. Female: 3 to 22 pg/ml
  1. TFI = (Total Testosterone / SHBG) x100
  • Interpretation
  1. See Androgen Decline in the Aging Male
  2. See Testicular Failure