There's something about routine diagnostics that causes docs to not put a lot of effort into interpreting the data. I had a sleep study plus MSLT done because my doctor suspected narcolepsy. The MSLT results came back just shy of the textbook definition of narcolepsy. Basically you take 5 15-minute naps and if you fall into REM sleep during 3 or more of the naps, insurance will accept a narcolepsy diagnosis.
When I read the summary though, it was obvious there were at least some mistakes in interpreting the data. I can't remember the details, but my doctor wasn't impressed and wanted to look at the data himself. Long story short, the place I got the test done at had no protocol for transferring that data anywhere. Which, btw, is a requirement under HIPAA. I have a legal right to have access to that data and to have it sent to another medical professional. From what I understand, the software they use has a proprietary file type and my doctor couldn't open it with anything he had. They could print it out, but it would be hundreds of pages and I'm not convinced they actually would do that unless I threatened to file a HIPAA report.
I ended up having to go to a different facility for another sleep study so that my doctor could actually see what was going on. If you've ever had one done, you know exactly how pleasant they are. 2 within 2 months of each other because the doc at the first place phoned it in is just ridiculous.
The data from the last study was clear enough that my doc was able to diagnose me with narcolepsy. That diagnosis allowed me to have Xyrem covered by my insurance. Between that and nuvigil, I'm still tired sometimes, but not the way I used to be. It took 8 years of being exhausted and miserable to finally find a doc that had the knowledge and the motivation to figure out what the hell was wrong with me. Even with a good doc, I still had to deal with the lack of effort some docs put into interpreting routine diagnostic tests.