Well, I can't count to 15 million & there is a pretty impressive amount of depth to the small amount that is there. There is also like zero way to control how much the slides compress the sample & so estimating the amount I can even view would just be a joke. Given the treatment of covid & the PCR tests, most establishment science is also a joke, so I am fairly satisfied with my rough examination in this particular instance.

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My guess would be that labs would measure volume of the original sample, then use something like a centrifuge to isolate and concentrate the swimmers. Then sample the concentration and dilute it with a specific volume of fluid, to decrease the density to something that is finitely countable. Then count, and multiply by the appropriate volumes to get to a count that is average per ml of the sample. image