Getting hearing aids is more like getting braces or a custom tailored garment than buying a smart phone. Done properly, it’s very labor intensive. In any medical field there is something called the Standard of Practice. That’s what experts in the field recommend regarding how to do a procedure. For hearing aids, that includes real-ear measurements, speech discrimination testing with the hearing aids on, and speech in noise testing. The problem is, not many audiologists actually follow the standard of practice. A poll published by Hearing Journal found that only 20% of audiologists consistently do real-ear measurements. Here’s a video on real-ear measurements.