Do I need a Testosterone, Free % test?
Do you experience irregular periods, skin changes, or unexplained weight shifts? These concerns may lead your healthcare provider to investigate your hormone balance, and free testosterone testing can be part of that picture.
Free testosterone (%) measures the proportion of testosterone in your body that's actively available to influence your tissues, rather than bound to carrier proteins.
Understanding this marker can help you and your healthcare provider make more informed decisions about your wellbeing. Free testosterone is associated with metabolic health, reproductive function, and overall vitality, so knowing your levels may support conversations about symptoms or health goals you're working toward.
What is it?
Free testosterone (%) represents the proportion of total testosterone that is biologically active and unbound to carrier proteins. It reflects how much testosterone remains free to act on tissues, influenced primarily by the concentration of sex hormone-binding globulin (SHBG).
Free testosterone is a powerful marker for evaluating androgen activity and diagnosing hormonal and metabolic conditions such as polycystic ovary syndrome (PCOS).
Book Your Test Now
Test Testosterone, Free % as part of 100+ biomarkers with Listen Health's annual membership.
Start Testing TodayWhy does it matter?
Free testosterone is a key biomarker for understanding androgen activity in women. Measuring it helps assess hormone balance, insulin sensitivity, and metabolic health. It provides a clearer picture than total testosterone alone, since only free testosterone reflects the amount your body can actually use.
Low free testosterone can contribute to fatigue, low energy, decreased libido, poor concentration, loss of muscle tone, and mood changes.
High free testosterone is a hallmark of polycystic ovary syndrome (PCOS) and can cause acne, excess hair growth (hirsutism), oily skin, scalp hair thinning, and irregular menstrual cycles.
Beyond reproductive symptoms, imbalanced free testosterone is linked to insulin resistance, metabolic syndrome, and cardiovascular risk — making it a key biomarker for women’s overall health.
Frequently Asked Questions
Related Biomarkers
DHEA-Sulfate
Anti-Mullerian Hormone
Testosterone / Estradiol (T:E2)
Total Iron-Binding Capacity
Thyroid Peroxidase Antibodies
Mean Corpuscular Volume (MCV)
AHPRA Disclaimer: This information is general in nature and should not replace individual medical advice. Always discuss your test results and health concerns with a registered healthcare practitioner.