Medical laboratory scientist here the doctors have to place specific orders for the test they need done I.E “covid, stool panel, respiratory culture”. Here in the micro lab we don’t except any order that reqest “test for everything” I think a lot of that is Medicare related, but it helps us to. In the case of bacterial culture we may or may not know what is in it based of site, stain, and experience. Also Doctors have years of education and training to narrow down their diagnosis to a few things that can be tested for. I hope that answers your question.
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