Quote Originally Posted by rocko1290 View Post
The only problem with that LabCorp test is I've found it measures the free T with pg/ml instead of ng/dl which is not commonly used so it's difficult to discern if it's within range of what your numbers ought to be. I also found that when I tried to convert pg/ml to ng/dl online, the numbers made no sense. Any advice on that?
Yes, it is true that LabCorp reports Free T in pg/mL, but converting the number to ng/dl is unnecessary. What's more important, is where the result they give you is within the 'normal' range. In fact, you should never attempt to compare results across labs, test methods and lab ranges differ from lab to lab so the more important factor is to compare the result within the lab's normal range.

The one caveat with Free T is that most labs (or at least LabCorp and one other I occasionally use) report Free T with age-adjusted normal ranges. The older you get, the lower the normal range. This is because Total T production normally decreases with age and SHBG increases with age. I'm 62, but do I want the hormones of their 60+ geriatric range? Hell no! I want the Free T of a 30-40 year old. In fact, my goal with TRT is to maintain Free T in the upper 75th percentile for a 30-40 year old healthy male, which using LabCorp ranges is about 21 to 22 pg/mL. (as opposed to 6.6-18.1 for my age group).