Natway, is that what your problem with all this is.....you actually believe that when the stool samples or actual parasites are sent to a lab that an "expert" actually looks at them under a microscope? No.
They take the sample, dilute it with something, shake it in a machine, and scan it by machine. It is not touched by human hands, I talked to the lab at the university hospital. You watch too much Monsters Inside me and Dr. House, it's not like that in real life.