Lab tests helps for diseases diagnosis, prognosis and managemnet of cases. It can also help for the selection of a group of similar drugs. Some times (rarely) it helps for the final selection of the remedy. If we go through the repertory, there are many rubrics that can be considered only by lab tests. However, even in modern medicine, lab test is not the final tool, they always correlate the reports with clinical findings. We homeopaths go further, and consider the individual features of the case!