Free Testosterone (%)

High values may indicate

A high percentage usually reflects low SHBG — seen with obesity, insulin resistance, hypothyroidism, or exogenous androgen use.

Low values may indicate

A low percentage usually reflects high SHBG — seen with aging, hyperthyroidism, liver disease, or high estrogen.

Frequently asked questions

What is a normal Free Testosterone (%) level?

A typical reference range for Free Testosterone (%) is 1.5 — 3 % (source: AI-generated (reviewed)). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.

What units is Free Testosterone (%) measured in?

Free Testosterone (%) is most commonly reported in %. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.

Where do Free Testosterone (%) reference ranges come from?

The reference range shown for Free Testosterone (%) is AI-generated and reviewed by BloodId — it is not from the ABIM standard. Educational information is from MedlinePlus (see our methodology). Reference ranges vary by lab, age, and sex, so always compare against the range on your own report.

Can I track Free Testosterone (%) over time?

Yes. Upload results from any lab and BloodId charts your Free Testosterone (%) over time against its reference range, so you can see whether the trend is rising, falling, or stable.

Related biomarkers

• ACE (Angiotensin-Converting Enzyme)
• ACTH
• Aldosterone
• Angiotensin I
• Angiotensin II
• Beta-HCG