A total testosterone will tell you almost as much as a combo total T and free T for 85% of the population. They are almost perfectly correlated and the reason you hear that total T is worthless is because internet Gurus realized they could get clicks :) Now if you are that 15% that has complicating factors like diabetes or are in bad health, the correlation is still there but far from perfect. That is why they require the Free T for those wanting T therapy. Be VERY careful going down the T therapy route. Depending on your age, there is no going back without bad consequences for most. If you have other health issues, I would fix those first and get a few more tests a few months apart before going down the T therapy route which can be wonderful I assume but is far from a free ride.