@mckenzie,
In our clinical lab, the owner, a PhD, M.D, did hear about results, had an eye out for the process. His PhD was in muscle physiology. The lab, after my time, became one of the world's biggie labs.
Same as you, McKenzie, pathologists I knew did pathology, as you say, cause of death and similar matters. Reading biopsy slides, and so on. Separate department from the main labs.
I did work at a lab for a while that was owned by a pathologist and a regular physician. We would never have called routine tests having pathology done.
I guess it's a language thing.