Free Testosterone (Direct)

Free Testosterone (Direct) refers to free testosterone measured directly rather than estimated from a formula. In our data this direct family includes methods such as equilibrium dialysis and ultrafiltration. These methods are often used when a clinician wants a non-calculated assessment of free testosterone, especially when changes in binding proteins such as SHBG may make calculated estimates less reliable.

Important Notes:

1. This is a measured, non-calculated free testosterone result.
2. Different labs may use equilibrium dialysis or ultrafiltration, so reference ranges can differ by method.
3. When possible, compare results over time using the same method.