I once (years ago) had a soil test at the county fair put on by the state Ag Uni. It was $3 for a quick onsite basic test or $15 for them to take your sample back to the lab at campus for the more indepth analysis. I opted for just the basic test.
The fella that took my money and my sample checked N on the paper before even opening the baggie. I asked him why he'd done that. His answer was along the lines of "all the plants use a lot of nitrogen and our native soil doesn't always have enough".
I told him the sample I'd brought wasn't native, it was a custom blend I'd spent time researching and putting together specifically for what I wanted to grow which wasn't leafy greens.
My brother thinks I'm sometimes quick to react negatively when I think someone is being dishonest or unfair. He may be right.