A patient with 900 ng/dL total testosterone and 8 ng/dL free testosterone likely has very high SHBG (80-90 ng/dL).

“So if a patient shows up and they've got a total testosterone of 900 nanograms per deciliter, which would place them at, you know, depending on the scale you look at, the scale we look at, that would place you at about the 70th percentile. But your free testosterone is, you know, eight nanograms per deciliter. So that's pretty bad. That means you're less than 1% free. A guy should be about 2% free T. So that dude should be closer to 16 to 18 nanograms per deciliter. So in that situation that I just gave you, his SHBG is really high. His SHBG is probably in the 80 to 90 range.”