One of the things you can't help but notice on this forum is that testosterone lab results seem to vary considerably. Of course, it varies by time of day, but there seems to be more to it than that.
One issue seems to be the type of test used. The standard immunoassay test, as it turns out, is not all that accurate, especially for low testosterone men That state-of-the-art test, used by the big labs, is now LC/MS-MS (liquid chromatography) and is supposedly much more accurate.
And LabCorp, for example, is billing that as most appropriate for hypogonadal males (and women/children) who require more sensitive measurements.
Just lettting everyone know. I have attached a couple of publicly available docs for those who are interested.
Why am I posting this? Well, for one thing, it may explain the differences we notice from test to test. And, also, I'm hoping that one of you may actually use it and let us know what you think...