Bioavailable vs Free Testosterone

[Cips1975]

Quest labs provided me with both a Free and Bioavailable testosterone level. All my last labs just provide Free not bio. I have seen these terms bio and free used interchangeably a lot but they are obviously different. What’s the main difference? and which is more meaningful for TRT purposes ?

 

[Systemlord]

Checking Free T using the equilibrium dialysis is the best method. I consistently see the bio T well above what Free T is showing. All methods have their problems.

 

[Cips1975]

Yep.. my bio is like double free.

 

[Cips1975]

My dose is 120 as a fyi