That number is not insanely high, but I would keep an eye on it. My last labs show a range of 2.5 - 22.5 ng/mL (I was at 7.9), so you would make it into the high end of that range. I'm not certain, but I thought TRT somewhat lowered prolactin levels...anyone here know the answer? You have already lowered your dose from 200mg to 100mg, and that test was taken at the 200mg level...maybe wait a month and retest to see where it is at.
Did you fast for your test? My labs have a note indicating that NOT fasting will give a higher result.