Well, for anyone interested, the cream I'm using did show up on the anabolic steroid test. It was detected as "testosterone" in an endless list of steroids. I had stopped it for 1 day and returned the next, hoping it would be out of my system by then.
The bad news is that it wasn't, and my endo will not put me on TRT. The good news is that I now know what dose of this cream puts me where. I went from 312ng/dl to 978ng/dl. My bioavailable testosterone was in the 600s, which was "through the roof" according to him. I blamed it on a form of L-arginine that I was taking, as he said many supplements can contain steroids, so I went with it.
Overall, I got the info I needed from the experience. My MRI turned out fine and I now have a pretty damn good level of test from a product that is cheaper than getting TRT through my insurance anyway.