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Intel Lab Diagnostics Dubai
Single Biomarker

Testosterone, Free

Free Testosterone

Free testosterone measures the biologically active form not bound to proteins. It is a more accurate indicator of androgen status than total testosterone, especially when SHBG levels are abnormal.

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  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Testosterone, Free test tells you

Free testosterone is the small portion of the hormone that is circulating unattached to any carrier protein. Most testosterone in the blood is bound (tightly to SHBG and loosely to albumin), and bound hormone cannot readily leave the circulation to act on muscle, bone, brain or reproductive tissue. The free portion, together with the loosely albumin-bound part, is what tissues can actually use. This is why free testosterone is often described as the biologically active fraction, and why it can tell a different story from the total.

The divergence between free and total testosterone is the whole reason this test exists. When SHBG is high (with an overactive thyroid, oral oestrogen, liver disease, low body weight, or simply increasing age), more of the hormone is held in reserve and the free fraction can be low while the total looks unremarkable. When SHBG is low, as it commonly is with excess weight, insulin resistance or type 2 diabetes, the reverse happens and the free fraction holds up better than the total. Your doctor therefore reaches for free testosterone when the total result and the symptoms do not fit each other, or when SHBG is expected to be unusual.

How the free value is obtained matters. Most laboratories calculate it from the total testosterone, SHBG and albumin measured on the same sample; a directly measured free testosterone by equilibrium dialysis is regarded as the reference approach but is not used routinely. Different calculations do not always agree closely, so results are best followed within one laboratory. Testosterone also has a daily rhythm, running higher in the morning and easing later in the day, which is why the sample is conventionally taken in the morning and why a single low result is normally repeated on a separate morning before anything is concluded from it.

Sample type
Blood
Measured in
pg/mL
Turnaround
24 Hours
Fasting
Not required
Best for
Adults planning a family
Why Get Tested?

Preferred test when total testosterone is borderline, SHBG is expected to be abnormal, or symptoms of androgen deficiency persist despite normal total testosterone.

  • When total testosterone misleads

    If SHBG is unusually high or low, the total can look normal while the active fraction does not: free testosterone resolves that mismatch.

  • Symptoms without a clear result

    Persistent fatigue, low libido or loss of muscle with a borderline total testosterone is a common reason to look at the free fraction.

  • Androgen excess in women

    In polycystic ovary syndrome a low SHBG raises the active fraction, so free testosterone can be more informative than the total.

  • Conditions that shift SHBG

    Thyroid disease, liver disease, obesity, oestrogen therapy and ageing all move SHBG, making the free measurement the more meaningful one.

When This Test Is Ordered

Reasons your doctor may request the Testosterone, Free test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Symptoms of low or excess androgen

    • Symptoms suggesting low testosterone in a man where the total result is borderline or does not match the picture.
    • Assessment of polycystic ovary syndrome, excess hair growth or persistent acne in a woman.
    • Investigation of reduced libido, erectile difficulty or loss of muscle mass and bone density.

  • When SHBG distorts the total

    • Known or expected abnormal SHBG: obesity, thyroid disease, liver disease or oestrogen therapy.

  • Adolescents & replacement therapy

    • Monitoring testosterone replacement therapy alongside the total measurement.
    • Assessment of delayed puberty or suspected androgen excess in an adolescent.
Preparation
The short version
No prep needed.
  • Blood
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
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    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
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    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

Attend in the morning if you can.

Testosterone follows a daily rhythm, running highest in the earlier part of the day, so a morning sample is the convention and keeps repeat tests comparable. Fasting is not strictly required, but a morning appointment before breakfast is often simplest and suits any other tests booked at the same time; follow whatever instruction you were given for those.

If you use a testosterone gel or cream, tell the team, avoid applying it to the arm being used, and wash your hands well beforehand, since gel on the skin can contaminate the sample and produce a falsely high result. Mention any opioid painkillers, steroid tablets, hormone therapy or anabolic steroid use.

Postpone the test if you are acutely unwell, as illness lowers testosterone temporarily. Expect a low result to be repeated on another morning before conclusions are drawn.

Understanding Your Results

The Normal band, 8.7 to 25.1 pg/mL, describes a typical adult male range; women sit far lower, so a woman's result is read against female expectations, not this band. A result in the Low band, 0 to 8.6 pg/mL, can reflect a genuine shortfall, but also a raised SHBG from thyroid overactivity, liver disease or age, or simply a sample taken later in the day, as testosterone peaks in the morning. A result in the High band, 25.2 to 50 pg/mL, is seen with a low SHBG from excess weight, insulin resistance or polycystic ovary syndrome, with testosterone or steroid use, and occasionally with testosterone gel left on the skin. It is usually calculated from total testosterone, SHBG and albumin, and formulas differ, so follow it in one laboratory. Illness, poor sleep and stress lower it temporarily, and a single low result is normally repeated on another morning before your doctor reads it.

SmartReport
8.625.1
Healthy zone17pg/mLNormal
Reference ranges · pg/mL
Low
Low: interpret with sex and clinical context.
0–8.6
Normal
Within a typical adult male range; lower in females.
8.7–25.1
High
Elevated: interpret with sex and clinical context.
25.2–50

Ranges are a guide: your physician interprets your result alongside your symptoms and history.

Reading a High or Low Result

  • What a higher result can point to

    • Polycystic ovary syndrome in women, particularly where a low SHBG raises the active fraction.
    • Testosterone therapy, anabolic steroid use or DHEA supplementation.
    • Congenital adrenal hyperplasia and other adrenal disorders that increase androgen production.
    • An androgen-producing tumour of the ovary or adrenal gland, which is uncommon but important to exclude.
    • Low SHBG from excess weight or insulin resistance, which raises the free fraction without the total necessarily rising.
    • Contamination of the sample from a topical testosterone gel applied to the skin before the blood draw.

  • What a lower result can point to

    • Testicular failure, whether from a genetic cause, injury, infection, or treatment for cancer.
    • A pituitary or hypothalamic problem that stops the signal reaching the testes, including tumours and pituitary damage.
    • Excess body weight and insulin resistance, which lower testosterone through several routes.
    • Long-term opioid painkillers, glucocorticoid treatment, or some hormone-suppressing cancer therapies.
    • A raised SHBG from thyroid overactivity, liver disease or age, which reduces the free fraction even when the total holds up.
    • Serious illness of any kind, which suppresses the reproductive hormone axis temporarily.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • In most laboratories the free value is calculated rather than measured, and different formulas give different answers, so results should be compared within one laboratory.
  • Testosterone follows a daily rhythm and varies from day to day, so a single low result is normally repeated on a separate morning before it is acted on.
  • Direct immunoassays for free testosterone are considered unreliable; a calculated value or equilibrium dialysis is preferred.
  • Acute illness, poor sleep and significant stress temporarily lower testosterone, so testing is best deferred until you are well.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1Free testosterone is the unbound fraction that tissues can actually use, unlike the bound majority.
  • 2It exists as a test because SHBG can make the total testosterone misleading in either direction.
  • 3Samples are conventionally taken in the morning, when testosterone is naturally at its highest.
  • 4A single low result is normally repeated before any conclusion is drawn.
  • 5It is usually calculated from total testosterone, SHBG and albumin rather than measured directly.
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Frequently Asked Questions

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Total testosterone counts everything in the blood, including the large share held by carrier proteins. Free testosterone counts only the unbound portion that tissues can use. When SHBG is unusual, the two can point in different directions, and the free value is generally the one that matches how a person feels.