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Free Androgen Index

Hormonal Health

48.00

Private Free Androgen Index Test in London for £48, measuring androgen activity with secure results in 1–2 days.

Turnaround time

1-2 days

Biomarkers count

1

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Same-Day Appointments

UKAS Accredited Labs

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Under 18? Patients under 18 can only be seen at GB Medlabs and Clinilabs, Monday to Friday only.

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Overview of the Free Androgen Index

The Free Androgen Index (FAI) Test is a private blood test that measures the Free Androgen FAI Index, an estimated indicator of the amount of biologically available testosterone circulating in the body. Rather than measuring testosterone production alone, the FAI helps estimate how much testosterone is available for the body's tissues to use, making it a valuable marker when assessing hormonal balance.

The FAI is commonly used as part of the investigation of hormone-related symptoms in both men and women. It may be requested when evaluating concerns such as changes in libido, fatigue, acne, excessive hair growth, hair thinning, irregular menstrual cycles, fertility concerns, or symptoms that may be associated with altered androgen activity. It can also be used to monitor hormone replacement therapy or other treatments affecting sex hormone levels under clinical supervision.

This is a single-marker hormone test that focuses specifically on the Free Androgen FAI Index. While it provides useful information about androgen activity, it is often interpreted alongside other hormone tests, such as testosterone and Sex Hormone Binding Globulin (SHBG), to provide a more complete understanding of hormonal health when clinically appropriate.

As with all laboratory investigations, this test does not diagnose hormonal disorders on its own. Results should always be interpreted alongside your symptoms, medical history, current medications, age, sex, and other relevant clinical information by a GP or suitably qualified healthcare professional.

What Does the Free Androgen Index Test Check?

Androgen Marker

Free Androgen FAI Index - An estimated measure of biologically available testosterone, used to help assess androgen activity in the body.

Who May Benefit From the Free Androgen Index Test ?

This test may be suitable for people who want to:

Investigate possible hormonal imbalance Gain insight into androgen activity when experiencing symptoms that may be linked to hormone fluctuations.

Assess androgen activity Measure the Free Androgen Index to help understand the level of biologically available testosterone.

Support the investigation of testosterone-related symptoms – Useful when exploring symptoms such as reduced libido, fatigue, acne, or changes in hair growth.

Monitor hormone replacement therapy (HRT or TRT) – Track androgen levels as part of ongoing hormone treatment under clinical supervision.

Support fertility and reproductive health assessments – May be included as part of a broader evaluation of reproductive hormone balance.

Monitor changes following lifestyle interventions – Compare results after changes to diet, exercise, weight management, or other health programmes.

Review the effects of supplements or prescribed treatments – Assess hormone levels before or during treatments that may influence androgen activity.

Take a proactive approach to hormonal wellbeing – Establish a baseline measurement or monitor hormone health over time, even without significant symptoms.

Arrange a private blood test in London without waiting for a GP referral – Access fast, convenient testing with clinic appointments and home visit options available.

Track hormonal trends over time – Repeat testing can help monitor changes in androgen activity alongside symptoms and clinical advice, providing a clearer picture of long-term hormone health.

Symptoms and Reasons to Consider the Free Androgen Index Test

You may wish to consider the Free Androgen Index Test if you are experiencing symptoms or concerns that may be linked with hormonal balance. This test may be relevant if you have:

Excess facial or body hair – Changes in androgen activity may influence hair growth patterns, particularly when hormone levels are altered.

Hormonal acne or changes in skin health – Increased androgen activity can sometimes be associated with changes in oil production and acne development.

Hair thinning or hair loss – Hormonal factors can contribute to changes in scalp hair growth and hair shedding patterns.

Irregular menstrual cycles – Changes in androgen balance may be considered when investigating cycle irregularities alongside other clinical factors.

Reduced libido – Altered sex hormone levels may contribute to changes in sexual desire and overall wellbeing.

Fatigue or reduced energy levels – Hormonal changes may be one factor considered when investigating ongoing tiredness or low energy.

Symptoms associated with testosterone imbalance – The test may provide information about androgen activity when assessing concerns related to testosterone levels.

Monitoring hormone replacement therapy – Useful for tracking androgen-related markers during hormone treatment under appropriate clinical guidance.

The Free Androgen Index provides information about biologically available testosterone and may help clinicians assess androgen status when considered alongside other hormone tests.

Hormonal symptoms can have many different causes. Results should always be interpreted alongside symptoms, medical history, medication use, age, sex, and professional medical advice where appropriate.

How to Prepare

Fasting

Fasting is not required unless advised at booking.

Hydration

Drink water before your appointment to support easier blood collection.

Medication

Continue prescribed medication unless your doctor or clinician tells you otherwise.

Supplements

Some supplements and hormone treatments may influence results.

Timing

Morning collection may be preferred for some bone turnover markers. Please check before booking.

Previous results

Keep previous hormone results if you wish to compare trends.

How to Book Your Free Androgen Index Test in London

Booking your Free Androgen Index with London Blood Tests is simple and designed to fit around your schedule.

1

Choose the Free Androgen Index

Select the Free Androgen Index online and review the included biomarkers before booking.

2

Select your sample collection option

Choose an in-clinic blood draw (+£35) or a home or hotel phlebotomy visit (+£60), where a qualified phlebotomist collects your sample and transports it to the laboratory.

3

Attend your appointment

Attend your appointment at our London clinic or have your blood sample collected at your home or hotel.

4

Laboratory analysis

Your sample is processed by an accredited laboratory after it has been received.

5

Receive your results securely

Your results are sent securely by email, ready to review yourself or discuss with a GP, specialist or qualified clinician.

When Will I Receive My Results?

Results are typically available within 1–2 days.

Your results will be sent securely by email. Turnaround time begins when the laboratory receives your sample and may not begin immediately after collection.

Occasionally, laboratory processing times may vary. If any results fall outside the expected reference range, they should be reviewed with a GP or suitably qualified healthcare professional.

Understanding Your Results

Reference ranges for the Free Androgen Index may vary between laboratories and testing methods.

A result within the reference range does not always exclude a hormonal condition, and an abnormal result does not automatically confirm a diagnosis.

Results should always be interpreted alongside symptoms, medical history, age, sex, medications, and any other relevant hormone investigations. If you have concerns about your results, speak with a GP or qualified clinician.

Why Book With London Blood Tests?

Private blood testing in London

Clinic and home visit options available

Specialist individual tests and advanced health panels

Secure results sent by email

Clear pricing before booking

Convenient appointment process

Support with choosing the right test

Suitable for patients who want private testing without a long wait

Private Free Androgen Index Test in London

At London Blood Tests, we provide private Free Androgen Index testing in London with fast appointments and rapid laboratory turnaround.

Choose from clinic appointments or home visit options depending on your location and testing requirements. If you're searching for a private blood test near me, we offer flexible sample collection and discreet testing.

The Free Androgen Index Test can provide useful laboratory information to support discussions with your GP, endocrinologist, or other healthcare professional as part of a broader hormone assessment.

Frequently Asked Questions

It measures the Free Androgen FAI Index, an estimate of biologically available testosterone.

It may be suitable for men and women who wish to investigate hormone balance or monitor androgen-related health.

No. Fasting is generally not required unless advised during booking.

It provides an estimate of available testosterone activity and is usually interpreted alongside other hormone tests.

Yes. Hormone therapies and certain medications may influence the Free Androgen Index.

Higher results may indicate increased androgen activity. Interpretation should always be based on your overall clinical picture.

Lower results may indicate reduced androgen activity, but further assessment is often required.

Results are typically available within 1–2 days after the laboratory receives your sample.

Yes. London Blood Tests offers private Free Androgen Index testing in London with clinic and home visit options.

GP consultations are available separately and can be arranged remotely, at home, using AI-supported services, or in clinic if required.