Metabolic Health

Free testosterone

Optimal Result: 35 - 155 pg/mL, or 3.50 - 15.50 ng/dL.

Testosterone is an androgen (male sex hormone) found in both men and women but in significantly larger quantities in men due to the testes. A small amount is made by our pituitary glands, and in women, by the ovaries. In pubescent boys, testosterone causes the voice to deepen, muscles to get bigger, sperm production to begin, and facial/ body hair to grow. Most of the testosterone in the blood is bound to a protein called sex hormone binding globulin. Testosterone that is not bound (“free” testosterone) may be checked if a man or a woman is having sexual problems, such as:

- Decreased sex drive

- Erectile dysfunction in men

- Infertility in men and women

- Delayed or accelerated puberty in boys

- Male features (deep voice, excessive hairiness) in women

In addition, certain conditions are known to affect free testosterone like hyperthyroidism and some types of kidney disease. 

Age-specific Reference Ranges (for men):

- 0-9 years < 1 pg/mL

- 10-11 years < 4 pg/mL

- 12-13 years < 68 pg/mL

- 14-15 years = 2-95 pg/mL

- 16-17 years = 26-119 pg/mL

- 18 years and older = 32-168 pg/mL

Tanner-stages spefific Reference Ranges (for men):

- Tanner stage I  < 3 pg/mL

- Tanner stage II < 15 pg/mL

- Tanner stage III < 68 pg/mL

- Tanner stage IV = 24-117 pg/mL

- Tanner stage V = 28-165 pg/mL

(To find out more about the different Tanner stages, please refer to: Tanner Stages)

What does it mean if your Free testosterone result is too low?

A low testosterone level in men may be due to:

- Hypothalamic or pituitary disease

- A genetic condition causing decreased testosterone production in young men

- Testicular failure / infertility, which can be genetic (myotonic dystrophy) or due to impairment (due to alcoholism, physical injury, or the mumps)

- A chronic disease like diabetes

A low testosterone level in women is normal and healthy.

What does it mean if your Free testosterone result is too high?

A high testosterone level in men may indicate:

- Testicular tumors

- Adrenal tumors producing testosterone

- Use of anabolic steroids

- Early puberty

- Congenital adrenal hyperplasia affecting the adrenal glands

Increased testosterone in women may be caused by:

- Ovarian or adrenal gland tumor

- Polycystic ovary syndrome

- Congenital adrenal hyperplasia affecting the adrenal glands

Understand blood, stool, and urine medical results from your labs.

10 000+ happy clients
100% satisfaction
★★★★★ customer support

Get 10% off of your first yearly or monthly plan.

Use promocode

Essential Plan


  • Monthly subscription
  • Instant interpretation
  • Use the free self-upload form
  • Additional charge for upload service
  • 2000+ biomarkers explained
  • Recommendations
  • Cancel anytime

Advanced Plan


  • Yearly subscription
  • Instant interpretation
  • We upload five reports for you
  • Use the free self-upload form
  • 2000+ biomarkers explained
  • Nutrition Recommendations
  • Online support
  • Cancel anytime

Own It For Life premium plan


  • No subscription
  • Unlimited access
  • Unlimited storage
  • Instant interpretations
  • We upload ten reports for you
  • Use the free self-upload form
  • 2000+ biomarkers explained
  • Nutrition Recommendations
  • Dedicated support

Healthmatters.io software for professional use.

Welcome to Healthmatters Pro.

Save time on interpreting lab results with the largest database of biomarkers online. In-depth research on any test at your fingertips, all stored and tracked in one place.

Learn More


We implement proven measures to keep your data safe.

At HealthMatters, we're committed to maintaining the security and confidentiality of your personal information. We've put industry-leading security standards in place to help protect against the loss, misuse, or alteration of the information under our control. We use procedural, physical, and electronic security methods designed to prevent unauthorized people from getting access to this information. Our internal code of conduct adds additional privacy protection. All data is backed up multiple times a day and encrypted using SSL certificates. See our Privacy Policy for more details.

General Data Protection Regulation (GDPR). HIPAA compliance for healthcare professionals
×

Understand Your Lab Result Now

  • Instant interpretation
  • 2000+ biomarkers explained
  • Science-based recommendations
  • Online support
  • Secure and private portal

Get 10% off with promocode:

;