Spotty,
Hmmm, same machine would be ideal tho not always practical as people relocate as well as facilities doing this testing. To have this done at the facility I last tested, I will have to travel 120 miles..
I think that the machines utilized in a major hospital setting would have to be checked on a very regular basis to ensure that they are working well enough and not producing significantly off results. A measure of quality control must be run on these machines regularly, system of checks and errors...
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