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Choose collection locationHormones & Fertility · Individual laboratory test
Free testosterone describes the fraction circulating independently of binding proteins. It can help assess symptoms when total testosterone is difficult to interpret.
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
Understanding the test
Also called Free Testosterone
Free testosterone may add information when a change in binding proteins is suspected, or when a total testosterone result does not explain the symptoms.
Free testosterone may help when a change in binding proteins makes total testosterone difficult to interpret.
The clinician considers the result with total testosterone, timing and the clinical history.
Before your sample
Ask which morning collection time is appropriate and whether any other tests require fasting. Report hormone treatment and the time of the last dose.
A clinician takes a small sample of blood from a vein. The laboratory uses serum, the liquid separated from the blood after it clots.
Smart Report
24 hoursLaboratory turnaround
Free testosterone methods and reference intervals differ. The clinician considers the collection time and other hormone values before interpreting a change.
From sample to follow-up

Choose your location, add the test to your care bag and select a time. If you are booking for someone else, assign the test to them in checkout.
Choose collection locationLook for Testosterone, Free in your report. Use the sample type and collection time when comparing it with an earlier report.
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Keep the assay, sampling time and units from both reports if you are comparing free testosterone between laboratories.
Health packages
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Patient questions
They represent different fractions and are reported on different scales. Use the interval for the particular measurement and method on your report.
Testosterone levels change during the day. For an assessment of low testosterone, your clinician may request morning samples taken at similar times. This reduces one source of variation. Illness, treatment and differences between assays can still affect the comparison.
Yes. Testosterone gel on the skin at the blood-draw site can contaminate the sample and make the result look high. Tell the team exactly when and where you applied your prescribed gel so they can choose a suitable sampling site.
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Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.