What kind of test do they offer? I did a hearing test through my high school's little audiology service once. It was so minimal, and it told them that I had significant hearing loss but not decibel information or anything really useful. I didn't realize their testing was just a way to see if there was a problem, and that I'd have to go somewhere else for actual results. If that's what their service is for, it might not be comprehensive.
I commiserate. When I was getting my records from my old elementary school district a few years ago they couldn't find any record of me before 4th grade. My tests were done in kindergarten and 1st grade. It was stressful. They finally found me tucked away in my sister's gifted learning program files. How'd I get there? (Also I learned the audiologist wanted me to be tested again every year to monitor me, and my parents never took me back. Also learned hearing aids were an option and my parents didn't want me to feel different, and also never asked me or gave me the option . . . 🙄) I've been meaning to find an audiologist to talk to, but I haven't made an appointment yet, so I don't know any insurance info about that.