Free Androgen Index
What is FAI?
A free androgen index is a blood test that is performed to determine the ratio of the hormone androgen within testosterone. Both males and females can undergo free androgen index test, as both the sexes have testosterone in their body. Fluctuating levels of androgen can have harmful effects for both.
Why is FAI done?
This test is required when men and women show certain symptoms. For men these symptoms may include the improper development of the sex organs, weakness, losing interest in sex and development of breasts.
In women, these symptoms can include improper menstrual cycle, prediabetes, obesity and more. This test can confirm whether these traits are caused due to hormonal imbalance.
Interpreting FAI results
For males, the normal testosterone level ranges from 300 to 1,000 ng/dL. Anything below 300 ng/dL is considered hypogonadism. For females, the level of testosterone in the blood can range from 20 to 70 ng/dL.