It's been some time since I performed this test, however here's what I found;
I'm solid to 14k, can hear 16k, but oddly, less at 15k. I'm guessing some sort of artifacts creeping in at 16k,.....
If not, I'm happy as my exposure to significant environmental noise has been significant.
Countless live rock shows, both in attendance and production, auto racing, working every NFL game in the RCA Dome, Indianapolis from the 90's until it's implosion. Few things I've ever encountered were as loud as 3rd down, the opposing team with the ball at the ol' RCA Dome,...staggeringly deafening at the most harsh frequencies,...nasty stuff. I always tried to have hearing protection handy, problem was I still had to communicate both in person, and by radio communication. Upon building Lucas Oil stadium, the ambient level for any given event dropped considerably. The crowd is much more spread out, more aisles, bigger aisles, much larger facility overall. Plus no concave surfaces focusing the sound as was the case in the Dome.
I would enjoy another audiologist examination. It's been a long, long time, I'd really enjoy learning the results from a test done proper.