[mcbits]

> Also, many tests require a centrifuge, so that's something else you have to account for if your goal is to perform the same tests with only one drop of blood. Unless your plan is to pull some Star Trek-level technology out of your hat.

That was basically the plan. Or failing that, to convince people that such technology existed or was close to existing. It's not too implausible that the centrifuge could be replaced with diffraction analysis or something since the goal is to test for the same things, not necessarily to "do the same tests." But that doesn't help if you're looking for something present in one in a million blood cells and only have a quarter-million cells to look at.