FAI testing is especially valuable for detecting hormonal imbalances, guiding diagnosis, and helping plan appropriate treatment for both men and women. At Diagnopein Nashik, we pro
The Free Androgen Index (FAI) is a crucial hormone test that estimates the amount of active or free testosterone available in the bloodstream. It is calculated using total testosterone and sex hormone-binding globulin (SHBG) levels. Unlike total testosterone, which includes both bound and unbound hormone, FAI focuses on the biologically active testosterone that affects tissues and organs.
1. Reflects Active Testosterone Levels
FAI helps measure the fraction of testosterone that is free and biologically active. Only free or loosely bound testosterone interacts with body tissues, making this index essential for assessing hormonal health.
2. Detects Hormonal Imbalances in Women
High FAI levels in women can indicate hyperandrogenism, often linked with conditions such as polycystic ovary syndrome (PCOS), irregular periods, acne, or hair thinning. Evaluating FAI can help identify these conditions early.
3. Monitors Androgen Status in Men
While FAI is more commonly used in women, it provides additional information on androgen availability in men and complements other testosterone tests.
4. Supports Metabolic and Reproductive Health Assessment
FAI levels can indicate shifts in metabolic and reproductive health, such as insulin resistance or fertility challenges, allowing timely interventions.
5. Cost-effective and Practical
Direct free testosterone measurement is complex and expensive. FAI provides an accessible and practical estimate of active testosterone levels, making it a reliable choice for routine hormonal assessment.
Early Detection of Hormonal Disorders: Helps detect androgen excess or deficiency even when total testosterone appears normal.
Supports PCOS Diagnosis: Critical for identifying hyperandrogenism in women with suspected PCOS.
Monitors Therapy Response: Tracks improvements or changes during hormonal treatment or lifestyle interventions.
Skin and Hair Health: Evaluates androgen-driven conditions like acne, hirsutism, or hair thinning.
Fertility Insights: Provides valuable information on reproductive health and ovulatory function in women.
At Diagnopein Nashik, our FAI test helps patients and doctors make informed decisions regarding hormonal health and treatment strategies.
1. Sample Collection:
A blood sample is collected, preferably in the morning, to account for natural testosterone fluctuations. Diagnopein ensures accurate and safe sample collection with trained professionals.
2. Parameters Measured:
Total Testosterone: Measures all testosterone in the blood, including bound and free forms.
SHBG (Sex Hormone–Binding Globulin): A protein that binds testosterone and reduces its activity.
3. Calculation of FAI:
FAI is calculated using the formula:
FAI=(Total TestosteroneSHBG)×100\text{FAI} = \left( \frac{\text{Total Testosterone}}{\text{SHBG}} \right) \times 100FAI=(SHBGTotal Testosterone)×100
This ratio estimates free testosterone levels in the body.
4. Result Interpretation:
Results are interpreted considering age, sex, and other hormone levels.
FAI is usually assessed alongside total testosterone and SHBG to provide a complete hormonal profile.
Diagnopein Nashik provides detailed reports and expert interpretation to help guide medical decisions.
5. Precautions:
Medications, supplements, liver or thyroid conditions, and pregnancy may affect SHBG levels and FAI results.
Morning sample collection and following pre-test instructions improve accuracy.
| Parameter | Description | Typical Range |
|---|---|---|
| Total Testosterone | Total testosterone in blood | Varies by sex and age |
| SHBG | Protein binding testosterone | Depends on age, sex, and health status |
| FAI | Ratio estimating free testosterone | Women: usually <5 (may vary) Men: typically 30–150 |
FAI is an estimate and should be interpreted along with other hormone tests for accurate diagnosis.
Comprehensive Hormonal Insight: Provides a practical estimate of bioavailable testosterone to assess hormonal balance.
Clinical Relevance: Useful for detecting PCOS, acne, hirsutism, hair thinning, reproductive issues, and metabolic risk.
Expert Interpretation: Our specialists provide detailed analysis alongside total testosterone, SHBG, and other relevant tests.
Convenient & Reliable: Morning sampling, standardized procedures, and precise calculation ensure accurate results.
Trusted Nashik Centre: Diagnopein Nashik is equipped with advanced lab facilities and a caring team to provide accurate FAI testing and consultation.
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.
