Wasp, there is a study on HRT and crit elevations (defined as >50). The incidence was about 40% for IM test, lower for transdermal. This is the one where the correlation was found with trough test levels. So, it's pretty common. Maldorf deals with it. So do I. Our doctors stay on top of this. When your doctor calibrates the dose over time, this is one of the variables, along with how you feel, blood levels, libido, what your prostate is doing, and the doctor's particular approach.
Mdotmdot, "crit" refers to hematocrit, which measures the red blood cells. Too high and coagulation can be impaired, leading to dangerous clots.
Stewie made the point that cycling, on and fully off, is better. That's right, I think. Really staying on all the time is a recipe for trouble. If you want HRT under a doctor, that's a different thing.