[bermanoid]

Can you explain the actual difficulties?

In particular, do you question whether the quality of the image would be high enough, or whether the ML techniques can automate what a lab tech does while looking through a lens, or is the problem that seeing blood is not enough to diagnose much of anything with any certainty?

"Reliable rate" is relative, and something that I've found lacking in modern medical care in the US even when it's a dude in a lab coat looking at samples through a state of the art microscope...