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The Free Androgen Index (FAI) test is an essential hormonal evaluation that measures the balance of active testosterone in the bloodstream. It helps in diagnosing PCOS, h
The Free Androgen Index (FAI) is a powerful tool used to assess the balance of androgens in the body, mainly testosterone. It provides insight into how much active, or “free,” testosterone is available to perform essential bodily functions. Since testosterone is bound to a protein known as Sex Hormone Binding Globulin (SHBG), only a portion remains bioavailable for normal physiological activity.
FAI is calculated using the ratio between total testosterone and SHBG levels, giving a more accurate picture of hormonal activity than a basic testosterone test. At Diagnopein, our advanced laboratory testing ensures precise FAI measurement using standardized methods for reliable diagnostic insights.
Monitoring the Free Androgen Index is crucial in diagnosing hormonal imbalances in both men and women. In women, a high FAI value may indicate conditions such as Polycystic Ovary Syndrome (PCOS) or other androgen-related disorders. In men, a lower FAI may signal hypogonadism, reduced testosterone production, or metabolic concerns.
The FAI test helps doctors understand whether the symptoms such as fatigue, acne, irregular menstrual cycles, or loss of libido are hormone-related. It also supports treatment planning for infertility, endocrine disorders, and metabolic issues.
By identifying abnormal androgen activity early, patients can receive timely medical attention and effective therapy, improving overall wellbeing and hormonal balance.
The benefits of the Free Androgen Index test include early detection of hormone imbalances, better treatment outcomes, and comprehensive insight into testosterone-SHBG interaction. This test is especially beneficial for:
Evaluating androgen excess or deficiency.
Assessing PCOS, infertility, or adrenal gland issues.
Monitoring testosterone replacement therapy.
Supporting metabolic and reproductive health evaluations.
Parameters measured during FAI testing usually include:
Total Testosterone (nmol/L)
Sex Hormone Binding Globulin (SHBG) (nmol/L)
Calculated Free Androgen Index (FAI = [Testosterone ÷ SHBG] × 100)
At Diagnopein, all test parameters are analyzed with accuracy, ensuring reliable results that contribute to correct diagnosis and personalized treatment plans.
The FAI test is a simple blood test performed under fasting or non-fasting conditions, based on your doctor’s advice. A small blood sample is drawn from your arm and sent to the laboratory for analysis. Our advanced analyzers measure both total testosterone and SHBG levels, and then calculate the Free Androgen Index ratio.
You don’t need extensive preparation before the test. However, it’s important to inform your doctor about any medications like steroids or hormone therapy that may influence results. Once results are ready, Diagnopein’s expert team helps interpret the values and guide you on next steps, whether it’s lifestyle adjustments or medical interventions.
Reliable and precise laboratory results
Experienced diagnostic professionals
Affordable and transparent pricing
Modern instruments ensuring accuracy
Fast turnaround time with online accessibility
At Diagnopein, we make your hormonal health assessment smooth, accurate, and accessible. Our laboratories follow strict quality standards, helping you take charge of your health confidently.
The FAI test involves a simple blood draw, so the risks are minimal and may include mild bruising, soreness, or infection at the puncture site. These side effects are rare and typically resolve quickly.
Yes, stress can affect hormone levels in the body, potentially altering the levels of SHBG or testosterone. Chronic stress may lead to changes in androgen levels, impacting the Free Androgen Index.
Yes, the FAI test can help in diagnosing infertility issues, especially when related to hormonal imbalances such as PCOS in women or low testosterone in men. Along with other hormonal tests, it aids in forming a comprehensive diagnosis.
Fasting is generally not required for the FAI test, but your healthcare provider may have specific instructions based on your overall health and any other tests being performed.
