My left ear is much worse than my right, and every audiologist and doctor seemed to think that was normal. But I am older.

I have facial numbness on that side so they did do a CT scan to check for acoustic neuroma. One-sided hearing loss can be related to that but there are generally other symptoms, like mine.

It sounds like your doc is being super cautious in the very very small chance your hearing loss is from something that needs addressing, and maybe because you are younger (are you?) it is more of a concern.