What is a good Free Testosterone level?

BioForge works to an optimal range rather than the lab's reference flag. For Free Testosterone that is 15–25 pg/mL (direct) or 12–20 ng/dL (equil.) or %Free 2.0–3.5%, measured in pg/mL — assay specific. A result inside the lab's normal range can still sit outside the range where most people feel and function well.

Learn · Testosterone, Estrogen & Binding

Free Testosterone

Measured in pg/mL — assay specific

The small unbound slice that can actually enter cells and do the work. Often the truer measure of how you feel.

What the numbers mean

These are the ranges BioForge works to. They are not the same as a lab's reference range, which is built from the general population rather than from people who feel well.

Low

<6.5 pg/mL (direct) · <5.0 ng/dL (equil.) · %Free <1.5%

Optimal

15–25 pg/mL (direct) · 12–20 ng/dL (equil.) · %Free 2.0–3.5%

High

>25 pg/mL (direct) · >21 ng/dL (equil.) · %Free >4.2%

What moves Free Testosterone

Driven almost entirely by SHBG. Also moved by albumin, insulin resistance, thyroid status, liver health, and estrogen. Units are not interchangeable between methods. Labcorp reports the direct immunoassay in pg/mL and the equilibrium method in ng/dL — a 15 on one is nothing like a 15 on the other. Always read against the range printed on your own report.

Related markers in Testosterone, Estrogen & Binding

Total Testosterone SHBG Estradiol (E2)DHT Estrone (E1)Estriol (E3)

This page is educational and is not medical advice. Ranges are general and do not account for your history, medications or symptoms — a single number never decides a protocol. Your results are interpreted by a licensed clinician alongside everything else about you. Back to the Learning Center

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