Add-on · Hormones
A free testosterone blood test measures the small share of testosterone that is not bound to proteins and is free to act on your tissues. Most tests estimate it from total testosterone and SHBG. Measuring it directly is most useful when SHBG is very high or very low, when the estimate is least reliable. You can add measured free testosterone to TrueVitals Ultimate for £79.
Add-ons are tested on the same blood draw as your panel and reported inside your clinician-reviewed report, read alongside your other 140 results. They are not sold on their own.
Pay in instalments with Klarna or Clearpay at checkout. Want it with Advanced instead? Email support@truevitals.co.uk and we will set it up.
Most of your testosterone travels bound to SHBG (tightly) and albumin (loosely). Only around 1 to 3% is completely free. Total testosterone tells you how much there is; free testosterone tells you how much is available.
Ultimate already reports total testosterone, SHBG and the free androgen index, a calculated ratio. The add-on measures free testosterone in the laboratory instead of estimating it.
Testosterone peaks in the morning, so test before about 11am. A single low result should be repeated before any treatment decision, which is also what UK guidance recommends. Your report uses the lab's own range and reads free testosterone with LH, FSH, prolactin, oestradiol and thyroid results to point to the likely cause.
| Option | Includes it | Price | What else you get |
|---|---|---|---|
| Ultimate + measured free testosterone | Yes | £478 incl. clinic draw (home visit £507) | Read alongside total testosterone, SHBG, FAI, LH, FSH, prolactin, oestradiol and thyroid. Clinician-reviewed report. |
| TrueVitals Ultimate on its own | Calculated only | £399 incl. clinic draw | Total testosterone, SHBG and the calculated free androgen index. |
| TrueVitals Advanced | Calculated only | £319 incl. clinic draw | Total testosterone, SHBG and FAI; the measured add-on is available by email. |
| NHS GP | On request | Free if clinically indicated | Usually total testosterone first; free testosterone is calculated or measured when SHBG is abnormal. |
TrueVitals prices checked 5 November 2026. Every TrueVitals report is clinician-reviewed. Pay in instalments with Klarna or Clearpay. Book a draw at one of 103 partner clinics, or add a home visit.
When to see your GP: erectile problems can be an early sign of heart disease or diabetes, and breast swelling, headaches or changes in vision with low testosterone need medical review.
A private panel is a good way to get a baseline, understand a result in context and track it over time. It does not replace your GP for symptoms, and anything that needs follow-up is flagged in plain words in your report.
Free testosterone on its own rarely tells the whole story. In TrueVitals panels it is reported with these related markers:
Ultimate includes total testosterone, SHBG and the free androgen index, which is calculated from them. Measured free testosterone is an add-on for £79.
For most people with SHBG in the normal range, yes. A measured value adds most when SHBG is very high or very low, or when results sit near the cut-off and symptoms do not match.
Before about 11am, after an overnight fast with water only. Testosterone is highest in the morning and food can lower it temporarily.
It is useful, particularly if you feel your dose is not working despite a good total level, or if your SHBG is high.
Yes. It can help with PCOS, acne and excess hair, read alongside the full female hormone results in Ultimate.
Some specialist add-ons are sent on to a reference laboratory. Your main report arrives within 4 working days, and if an add-on result comes back later it is added to your report automatically and we let you know.
How this page was written: by James Smillie, founder of TrueVitals, reviewed by the TrueVitals clinical review team, using NHS and laboratory reference sources. Ranges are typical values; your report uses your lab's own ranges. TrueVitals sells the panels named on this page, so we have stated plainly what this test cannot do. Last updated 5 November 2026.
Ultimate + measured free testosterone: £478 including the clinic draw, or £507 with a home visit. Clinician-reviewed report.
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