Free Testosterone Test
May 14, 2026
Free Testosterone Test
A free testosterone test measures the unbound, active form of testosterone—only 2-3% of testosterone circulates freely, with the rest bound to proteins (SHBG and albumin), and it's this free testosterone that actually enters cells and produces effects on energy, libido, muscle, mood, and cognition. When symptoms suggest low testosterone but total testosterone is "normal," free testosterone often reveals the problem.
At Blood Test London, free testosterone testing costs from £275 with results in 2-3 days. A doctor always reviews every result.
Total vs Free Testosterone
Type | What It Is | When It Matters |
|---|---|---|
Total testosterone | All testosterone in blood | Initial screening |
Free testosterone | Unbound, active form (2-3%) | More accurate symptom correlation |
SHBG | Binding protein | Explains total vs free discrepancy |
When Free Testosterone Is More Important
Normal total but low-T symptoms
Obesity (SHBG often low)
Older age (SHBG often high)
Liver disease
Thyroid disease
Reference Ranges
Men
Marker | Normal Range |
|---|---|
Total testosterone | 10-30 nmol/L |
Free testosterone | 0.2-0.6 nmol/L |
SHBG | 15-55 nmol/L |
Women
Marker | Normal Range |
|---|---|
Total testosterone | 0.5-2.5 nmol/L |
Free testosterone | 0.01-0.03 nmol/L |
Our Testosterone Testing Options
Free Testosterone Panel - £275
Free testosterone (calculated)
Total testosterone
SHBG
Doctor review
Complete Male Hormone - £395
All above plus:
LH, FSH
Oestradiol
Prolactin
Detailed interpretation
Full Hormone MOT - £495
Complete panel
Thyroid function
Cortisol
Extended consultation
Book Your Free Testosterone Test
Book Your Test
Price: From £275
Results: 2-3 days
Doctor review: A doctor always reviews every result
Best time: Morning (before 10am)
Book via WhatsApp | Phone: 020 3951 3429
Blood Test London by The Wellness. Free testosterone testing from £275. A doctor always reviews every result.