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" ... There are some assays, like a blood test called procalcitonin, that can help distinguish between bacterial and viral infections. The gene expression classifier was more accurate than procalcitonin (86% vs. 78%) In my experience, working in community hospitals, the procalcitonin level is not helpful, as results take at least three days to return. (Turnaround times are sometimes faster at a large or university hospital.) The patient is likely to be discharged by then, or dead. ... "